sound-effects

어떤 스킬인가요?

Add a measured sound pass to a motion-graphics video made with Claude Code (HyperFrames, Remotion, GSAP, Claude Motion or the motion-broll skill). Builds a cue list, checks the music's beat grid against the kick drums, lands cuts on the beat, places one real sound effect per cue from a bundled CC0 library, mixes to -16 LUFS with true peaks below -4 dBFS measured on the exported MP4, and proves it with frames, waveforms and 5 timestamps for a human to check. Use when someone wants sound effects, sound design or music added to a motion-graphics video, or says their AI video sounds like cheap beeps.

설치 방법

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스킬 원문 파일

---
name: sound-effects
description: Add a measured sound pass to a motion-graphics video made with Claude Code (HyperFrames, Remotion, GSAP, Claude Motion or the motion-broll skill). Builds a cue list, checks the music's beat grid against the kick drums, lands cuts on the beat, places one real sound effect per cue from a bundled CC0 library, mixes to -16 LUFS with true peaks below -4 dBFS measured on the exported MP4, and proves it with frames, waveforms and 5 timestamps for a human to check. Use when someone wants sound effects, sound design or music added to a motion-graphics video, or says their AI video sounds like cheap beeps.
---

# Sound effects

Claude can't hear. So this skill never judges sound by feel: it measures every step, and it hands the user 5 timestamps to check with headphones. It never says "it sounds good".

The approach is Vox's sound-pass prompt (@Voxyz_ai, https://x.com/Voxyz_ai/status/2109358372873183564, 11 Oct 2026). Keep that credit.

## Default kit (use this first)
`sfx/manifest.json` → `default_kit`: one sound per core category, picked by ear by Bart (12 Oct 2026). Use it unless the user asks for something else.

| Category | Sound | Where it comes from |
|---|---|---|
| whoosh | "Whoosh" by qubodup | bundled `sfx/kit/whoosh.ogg` (CC0) |
| click | "Classic Click" by adh.dreaming | bundled `sfx/kit/click.ogg` (CC0) |
| pop | "POP SFX Neutral" by ethernel0 | bundled `sfx/kit/pop.ogg` (CC0) |
| riser | "Cinematic Riser #3 subtle" | bundled `sfx/kit/riser.ogg` (CC0) |
| impact | "soft_impact3" by peoplearehappy | bundled `sfx/kit/impact.ogg` (CC0) |
| tick | "Click / Tick" by Squirrel_404 | bundled `sfx/kit/tick.ogg` (CC0) |
| typing | Mixkit "Fast laptop keyboard typing" (#1392) | **downloaded at runtime** into `<out>/sound-effects-cache/` (Mixkit licence: never commit it) |

Everything else in the manifest is an alternative (`alt_categories` lists which categories can stand in for each other). See `TOP-PICKS.md` for credits.

## Rules
- **Never synthesize music or sound effects in code** (no oscillator or sine beeps). Use real recorded files.
- **Sound effects: use the bundled library first.** `sfx/manifest.json` lists every file with its category, duration, source and licence. All bundled files are CC0.
- If the bundled library has nothing that fits, use the `runtime` entries in the manifest (Mixkit). Download them into the user's project, never into this skill folder, and never commit them. Mixkit allows use in videos but not standalone redistribution.
- **Music:** a track the user gives you, or one from `MUSIC.md` (suggested free tracks by feel, downloaded at runtime, never committed). Write the source and licence into `SOUND.md`. If the user has no track, suggest 2–3 from `MUSIC.md` that fit the video and let them pick.
- **Licences:** only CC0 and Mixkit Free License count as free and safe; the script checks every sound it places. Don't list licences sound by sound. If all are known, tell the user once: the sounds are listed as CC0 or Mixkit Free License by their sources, sources can change their terms so check the source page now and then. If the script reports an unknown licence, name that exact sound, its licence and its source link, and tell the user not to publish until it is checked or swapped. Never describe an unknown licence as probably fine.
- **Music licence:** ask where the track came from and pass `--music-source "track, artist, link"` and `--music-license "..."`. Without them the run marks the music LICENCE NOT CONFIRMED; say so plainly.
- **Credits:** every run writes `CREDITS.txt`, a paste-ready list of the sounds actually used and the music. Recommend it once: optional, for a YouTube, Instagram or TikTok description; CC0 needs no credit, but the list is proof of source if a platform flags the audio.
- Measure the **exported MP4**, never the intermediate WAV.
- Measure the **exported MP4**, never the intermediate WAV.

## 0. Licence check (during the edit, before you export)
Sources change their terms, so check the current terms for **what this video actually uses**, every time, before the final export:

1. **Use case.** Ask where the video will be published, unless it is already clear (for example "my YouTube video"): YouTube, Instagram, TikTok, other social, online ads, a podcast, client work, TV or radio broadcast, a video game, CDs or DVDs, or a template or tool for other people. Pass it as `--use-case "..."` so it lands in `SOUND.md`.
2. **Sources.** For each source used in this video (the providers in `CREDITS.txt`, plus the music), open its current licence page (web fetch; if the site blocks it, the user's browser) and check two things: the terms still say what the table below says, and the use case is allowed. For Freesound, open the page of each sound actually used and confirm it still says Creative Commons 0. For the music, open the track's page.
3. **Report it plainly**, one line per source: "Checked today: Mixkit Stock Music Free License, unchanged, YouTube allowed." If a source changed its terms or the use case is not allowed, name the exact sound or track and why, and swap it before exporting. Never call an unchecked or unclear licence fine.

| Source | Licence page | Allows (checked 13 Oct 2026) | Doesn't allow |
|---|---|---|---|
| Freesound, CC0 | the sound's own page | anything, no credit needed | nothing (CC-BY needs a credit; never use CC-BY-NC commercially) |
| Kenney | the pack's page on kenney.nl | anything (CC0) | nothing |
| Mixkit sound effects | https://mixkit.co/license/#sfxFree | web, social, podcasts, games, films, CDs/DVDs, TV/radio | redistributing the file on its own or inside a tool or template; registering it with a rights service |
| Mixkit music | https://mixkit.co/license/#musicFree | YouTube, social, online ads, podcasts, education | CDs/DVDs, TV/radio, video games, remixing, registering it with Content ID |

Mixkit forbids redistributing its files "in a tool or template", which is why this skill never stores Mixkit sounds or music: they are downloaded into the user's project at runtime.

## 1. Set up
Needs ffmpeg and Python 3.10+. Install into a folder you can delete:
```
python3 -m venv .sound-effects
.sound-effects/bin/pip install librosa soundfile numpy scipy matplotlib
```

## 2. Build the cue list
Read the video's duration and fps with `ffprobe`. List every moment that needs a sound. Take them from the composition source when you can (HyperFrames/Remotion timeline, GSAP labels, motion-broll `plan.json`). Otherwise detect scene cuts with `ffmpeg -i in.mp4 -vf "select='gt(scene,0.3)',showinfo" -f null -`.
Write `cues.json` as `[{"t": 2.0, "type": "scene_cut", "desc": "cut to card"}, {"t": 4.2, "type": "typing", "dur": 1.3, "desc": "..."}]`.

The cue types map to library categories (`category_map` in the manifest):

| Cue type | Category | Notes |
|---|---|---|
| movement (slide, camera move) | whoosh | starts 2 frames early; pick length to match the move |
| scene_cut | whoosh | short whoosh, 2 frames early (`transition` sounds are alternatives) |
| appear | pop | on the frame |
| click | click | on the frame |
| typing | typing | looped/trimmed to `dur`, quiet |
| build_up | riser | **ends** on the next hit |
| reveal | impact | the loudest SFX |
| success | pop | (`ding` sounds are alternatives) |
| error_or_tech | glitch | |
| hover_or_small_ui | tick | very quiet (`ui-blip` and `click` are alternatives) |
| bed | ambience | under everything, optional |

Use one sound per cue. Vary takes within a category so repeats don't sound robotic.

## 3. Beat grid, and check it
Run `librosa.beat.beat_track`. **librosa sometimes locks onto the off-beat.** Low-pass the music below 120 Hz, plot it against the beat lines for the first 4 bars, and compare where the kicks land. If the kicks don't sit on the lines, shift the whole grid by the median offset and plot again. Show the user `beatgrid.png`.

## 4. Put the big moves on the beat
Hard cuts and reveals should land on a beat. If you can change the animation timings, change them. If you can't, move where the music starts (search offsets and pick the one with the smallest cut-to-beat error). Report the error per cut in ms.

## 5. Place SFX and mix
Priority: **voiceover > SFX > music.** The music bed sits around -12 dB under the SFX and ducks under any voiceover by 8–12 dB.
Target **about -16 LUFS integrated** with **true peak below -4 dBFS**, so nothing clips after AAC compression or on a phone speaker. Export, measure, adjust gain or add a limiter, then export and measure again:
```
ffmpeg -nostats -i after.mp4 -af ebur128=peak=true -f null - 2>&1 | tail -12
ffmpeg -nostats -i after.mp4 -ac 1 -af ebur128=peak=true -f null - 2>&1 | tail -12   # mono check
```

## 6. Prove it
For every cue, grab one frame just before and just after it from the exported MP4, and plot the waveform around it (`checks/cue-XX.png`). Then pick the **5 riskiest timestamps** (largest beat error, long sounds such as typing and risers, the reveal) and give them to the user to check with headphones.

## Original-quality files
The bundled sounds are compressed OGG Vorbis previews (trimmed, normalised, often mono), which is fine for most videos. If a sound is too low quality for the job (audible artefacts, a close-up hero sound, a final master), fetch the original:
- Look up the entry's `source_url` in `sfx/manifest.json`. Every bundled and `default_kit` entry has one.
- **Freesound** (`freesound.org/people/<user>/sounds/<id>/`): the original is the Download button on that page. It needs a free Freesound account, so ask the user to download it (or use their API key if they give you one).
- **Kenney** (`kenney.nl/assets/<pack>`): download the pack zip from that page. Each Kenney entry's `original_file` in the manifest names the exact file, e.g. `kenney_interface-sounds.zip → Audio/click_001.ogg`. The rule: drop the prefix (`kenney-interface-` → interface-sounds, `kenney-ui-` → ui-audio, `kenney-digital-` → digital-audio, `kenney-impact-` → impact-sounds, `kenney-sci-` → sci-fi-sounds), then match the rest inside `Audio/` ignoring case, with `-` read as `_` (`kenney-digital-phaserup1` → `Audio/phaserUp1.ogg`, `kenney-impact-impactpunch-heavy-000` → `Audio/impactPunch_heavy_000.ogg`). Kenney's originals are OGG too, but unprocessed.
- Save originals into the user's project (for example `sound-effects-cache/originals/`), never into this skill folder, and pass the file to the script via `--swaps` or by editing a copy of the manifest. Apply the same trim and level as the bundled file.

## Find more sounds
When the user wants more or different sounds, search these sources, suggest 3–5 candidates with a link, creator and licence for each, and let the user pick. Before using any of them, open its page, confirm the licence shown today, and check it allows the user's use case (step 0); add it to `CREDITS.txt`. Only use or redistribute a sound as its licence allows. For music, see `MUSIC.md`.

| Source | Search | Licence notes |
|---|---|---|
| Freesound | `https://freesound.org/search/?q=<words>&f=license:"Creative Commons 0"` | Use the CC0 filter. CC0 can be bundled and needs no credit (credit anyway). CC-BY needs credit in the video description; never bundle CC-BY-NC or use it commercially. |
| Kenney | `https://kenney.nl/assets/category:Audio` | All CC0. Free to use and bundle. |
| Mixkit | `https://mixkit.co/free-sound-effects/<category>/` (e.g. `whoosh`, `typing`) | Mixkit SFX Free License: fine in videos, including monetised ones, but **no redistribution**. Download only into the user's project at runtime; never commit or bundle it. |
| Pixabay | `https://pixabay.com/sound-effects/search/<words>/` | Free in videos, no credit needed, but no standalone redistribution. The user downloads it in a browser; never bundle it. |
| Sonniss GDC bundles | `https://sonniss.com/gameaudiogdc/` | Royalty-free in videos; no raw redistribution or AI training. Local use only. |
| YouTube Audio Library | YouTube Studio → Audio Library | For YouTube videos only; available only inside Studio. Never bundle it. |

Only CC0 sounds may be added to this repo's `sfx/` folder, each with a manifest entry (file, category, duration, source_url, licence, attribution) and a row in `LICENSES.md`.

## Script
`scripts/sound_pass.py` runs steps 3–6 end to end:
```
.sound-effects/bin/python scripts/sound_pass.py --video silent.mp4 --cues cues.json \
  --music track.mp3 --manifest sfx/manifest.json --out out/
```
Add `--use-case "..."`, and `--music-source`/`--music-license` once confirmed. It outputs `after.mp4`, `report.html`, `SOUND.md` (licence check, log, cue → file table, LUFS and peak numbers, the 5 timestamps), `CREDITS.txt`, `beatgrid.png` and `checks/`. Read its log and fix anything over target. If you changed the animation timings, re-render first.

## 7. Swap report
`sound_pass.py` also writes `report.html`. It lists every cue with its timestamp, category, the sound used (with a play button), the source page, licence and credit, plus the alternatives in that category, each with a play button and a "let model decide" option. Open it for the user. They choose, click **Download swaps.json**, and you re-run with `--swaps swaps.json`. `"auto"` means pick another sound from the alternatives. Keep cue indices stable between runs.

## Report to the user
Report the licence check (all known, or each unknown sound by name), the use case and whether it is allowed, the music source and licence (or that it is not confirmed), that `CREDITS.txt` is there if they want it, the beat-grid result (shifted or not, and by how much), the cut-to-beat errors, final LUFS and true peak (stereo and mono), and the 5 timestamps. Don't tell them it sounds good.

"""Writes report.html after a sound pass: every cue with the sound used, source, licence,
play buttons, and alternatives to swap (or 'let model decide'). Exports swaps.json."""
import os,json,html,shutil
def write(out,placed,video,lufs,peak):
  e=html.escape
  vid=os.path.relpath(os.path.join(out,'after.mp4'),out)
  rows=[]
  for c in placed:
    used=os.path.relpath(c['sfx_path'],out)
    opts=[f'<label class=o><input type=radio name="c{c["idx"]}" value="" checked> keep</label>',
          f'<label class=o><input type=radio name="c{c["idx"]}" value="auto"> let model decide</label>']
    for a in c['alternatives']:
      if a['id']==c['sfx']: continue
      opts.append(f'<div class=o><label><input type=radio name="c{c["idx"]}" value="{e(a["id"])}"> {e(str(a["label"])[:40])}</label> <audio controls preload=none src="{e(a["play"])}"></audio> <a href="{e(a["source_url"] or "#")}" target=_blank>source</a> <span class=m>{e(a["license"] or "")}</span></div>')
    rows.append(f'''<tr><td><button onclick="seek({c['t']})">{c['t']:.2f}s</button></td><td>{e(c['type'])}<br><span class=m>{e(c.get('desc',''))}</span></td><td><b>{e(c['category'])}</b></td>
<td>{e(os.path.basename(str(c['sfx'])))}<br><audio controls preload=none src="{e(used)}"></audio><br><a href="{e(c['source_url'] or '#')}" target=_blank>source page</a> · <span class=m>{e(c['license'] or '')}</span><br><span class=m>{e(c['credit'] or '')}</span></td>
<td><details><summary>alternatives ({len(c['alternatives'])})</summary>{''.join(opts)}</details></td></tr>''')
  doc=f'''<!doctype html><meta charset=utf-8><title>Sound pass report</title>
<style>body{{font-family:system-ui;background:#111;color:#eee;margin:20px}}table{{border-collapse:collapse;width:100%}}td{{border-bottom:1px solid #333;padding:8px;vertical-align:top}}.m{{color:#999;font-size:12px}}a{{color:#9cf}}.o{{margin:4px 0}}audio{{height:28px;vertical-align:middle}}button{{background:#d97757;color:#fff;border:0;border-radius:6px;padding:6px 10px;cursor:pointer}}video{{max-height:420px}}</style>
<h1>Sound pass report</h1><p>Final mix: <b>{lufs:.1f} LUFS</b>, true peak <b>{peak:.1f} dBFS</b> (measured on the exported MP4). Approach: Vox (@Voxyz_ai).</p>
<video id=v controls src="{e(vid)}"></video>
<p>Click a timestamp to jump there. To swap a sound, pick an alternative or "let model decide", then <button onclick="dl()">Download swaps.json</button> and re-run:<br><code>python scripts/sound_pass.py ... --swaps swaps.json</code> (or tell Claude "apply swaps.json").</p>
<table><tr><th>time</th><th>cue</th><th>category</th><th>sound used</th><th>swap</th></tr>{''.join(rows)}</table>
<script>function seek(t){{const v=document.getElementById('v');v.currentTime=Math.max(0,t-0.5);v.play()}}
function dl(){{const s={{}};document.querySelectorAll('input[type=radio]:checked').forEach(i=>{{if(i.value)s[i.name.slice(1)]=i.value}});
const a=document.createElement('a');a.href=URL.createObjectURL(new Blob([JSON.stringify(s,null,1)],{{type:'application/json'}}));a.download='swaps.json';a.click()}}</script>'''
  open(os.path.join(out,'report.html'),'w').write(doc)

{
 "version": 1,
 "created": "2026-10-12",
 "format": "OGG Vorbis 48 kHz (q4; ambience q3 mono); mono where channels were identical",
 "normalisation": "one-shots: leading silence trimmed, max 4s (risers 6s), peak-normalised to -3 dBFS. ambience: 20s, 1s fades, -35 LUFS. Repo copies: trailing silence below -60 dB trimmed, converted from WAV to OGG.",
 "category_map": {
  "movement": "whoosh",
  "scene_cut": "whoosh",
  "appear": "pop",
  "click": "click",
  "typing": "typing",
  "build_up": "riser",
  "reveal": "impact",
  "success": "pop",
  "error_or_tech": "glitch",
  "hover_or_small_ui": "tick",
  "bed": "ambience"
 },
 "bundled": [
  {
   "file": "whoosh/fs-264777-swoosh.ogg",
   "category": "whoosh",
   "duration_s": 4.0,
   "length": "long",
   "source_url": "https://freesound.org/people/Shinplaster/sounds/264777/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "Shinplaster via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "whoosh/fs-169867-swoosh.ogg",
   "category": "whoosh",
   "duration_s": 2.21,
   "length": "long",
   "source_url": "https://freesound.org/people/Halgrimm/sounds/169867/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "Halgrimm via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "whoosh/fs-127197-fast-simple-chop-5-aif.ogg",
   "category": "whoosh",
   "duration_s": 0.48,
   "length": "short",
   "source_url": "https://freesound.org/people/dave.des/sounds/127197/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "dave.des via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "whoosh/fs-683101-quick-woosh.ogg",
   "category": "whoosh",
   "duration_s": 1.86,
   "length": "long",
   "source_url": "https://freesound.org/people/florianreichelt/sounds/683101/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "florianreichelt via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "pop/fs-447910-plop.ogg",
   "category": "pop",
   "duration_s": 0.24,
   "source_url": "https://freesound.org/people/Breviceps/sounds/447910/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "Breviceps via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "pop/fs-467951-ui-button-click.ogg",
   "category": "pop",
   "duration_s": 0.12,
   "source_url": "https://freesound.org/people/benzix2/sounds/467951/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "benzix2 via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "pop/fs-258269-mouth-pop.ogg",
   "category": "pop",
   "duration_s": 0.32,
   "source_url": "https://freesound.org/people/jcallison/sounds/258269/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "jcallison via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "pop/fs-514833-user-interface-menu-sounds-wav.ogg",
   "category": "pop",
   "duration_s": 4.0,
   "source_url": "https://freesound.org/people/oussamaben/sounds/514833/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "oussamaben via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "pop/fs-824189-pop-in-sfx.ogg",
   "category": "pop",
   "duration_s": 0.45,
   "source_url": "https://freesound.org/people/Sadiquecat/sounds/824189/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "Sadiquecat via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "typing/fs-323432-typing.ogg",
   "category": "typing",
   "duration_s": 4.0,
   "source_url": "https://freesound.org/people/Alivvie/sounds/323432/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "Alivvie via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "typing/fs-79388-keyboard-typing-wav.ogg",
   "category": "typing",
   "duration_s": 4.0,
   "source_url": "https://freesound.org/people/j1987/sounds/79388/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "j1987 via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "typing/fs-416777-digital-typing-wav.ogg",
   "category": "typing",
   "duration_s": 1.0,
   "source_url": "https://freesound.org/people/Sky_Motion/sounds/416777/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "Sky_Motion via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "typing/fs-511418-data-reveal-sound.ogg",
   "category": "typing",
   "duration_s": 2.03,
   "source_url": "https://freesound.org/people/Sky_Motion/sounds/511418/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "Sky_Motion via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
   "bundled": true
  },
  {
   "file": "typing/fs-447909-keyboard-typing.ogg",
   "category": "typing",
   "duration_s": 3.8,
   "source_url": "https://freesound.org/people/Breviceps/sounds/447909/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "Breviceps via Freesound (CC0; credit optional)",
   "note": "Freesound HQ preview of a CC0 sound",
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   "file": "tick/fs721514.ogg",
   "category": "tick",
   "duration_s": 0.04,
   "source_url": "https://freesound.org/people/BaggoNotes/sounds/721514/",
   "license": "CC0 1.0",
   "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
   "attribution": "BaggoNotes via Freesound (CC0; credit given voluntarily)",
   "note": "Points_Tick2 by BaggoNotes",
   "bundled": true
  }
 ],
 "runtime": [
  {
   "category": "whoosh",
   "mixkit_id": "1489",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1489/1489-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/whoosh/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "whoosh",
   "mixkit_id": "1492",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1492/1492-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/whoosh/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "whoosh",
   "mixkit_id": "1491",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1491/1491-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/whoosh/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "whoosh",
   "mixkit_id": "1714",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1714/1714-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/whoosh/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "transition",
   "mixkit_id": "166",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/166/166-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/transition/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "transition",
   "mixkit_id": "1490",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1490/1490-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/transition/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "typing",
   "mixkit_id": "1386",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1386/1386-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/typing/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "typing",
   "mixkit_id": "2531",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2531/2531-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/typing/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "typing",
   "mixkit_id": "2532",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2532/2532-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/typing/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "typing",
   "mixkit_id": "1393",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1393/1393-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/typing/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "click",
   "mixkit_id": "1133",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1133/1133-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/click/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "click",
   "mixkit_id": "275",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/275/275-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/click/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "click",
   "mixkit_id": "900",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/900/900-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/click/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "click",
   "mixkit_id": "1109",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1109/1109-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/click/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "pop",
   "mixkit_id": "2358",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2358/2358-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/pop/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "pop",
   "mixkit_id": "2364",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2364/2364-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/pop/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "pop",
   "mixkit_id": "2354",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2354/2354-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/pop/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "pop",
   "mixkit_id": "3005",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/3005/3005-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/pop/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "glitch",
   "mixkit_id": "2595",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2595/2595-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/glitch/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "glitch",
   "mixkit_id": "2566",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2566/2566-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/glitch/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "glitch",
   "mixkit_id": "1457",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1457/1457-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/glitch/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "glitch",
   "mixkit_id": "1033",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1033/1033-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/glitch/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "ding",
   "mixkit_id": "2870",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2870/2870-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/notification/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "ding",
   "mixkit_id": "933",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/933/933-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/notification/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "impact",
   "mixkit_id": "1143",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1143/1143-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/impact/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "impact",
   "mixkit_id": "2908",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2908/2908-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/impact/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "impact",
   "mixkit_id": "788",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/788/788-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/impact/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "impact",
   "mixkit_id": "2198",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2198/2198-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/impact/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Download at runtime into the user project; never commit (no standalone redistribution). Listen before use; titles not recorded."
  },
  {
   "category": "click",
   "mixkit_id": "3124",
   "title": "Modern technology select",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/3124/3124-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/click/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "click",
   "mixkit_id": "1113",
   "title": "Mouse click close",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1113/1113-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/click/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "typing",
   "mixkit_id": "1372",
   "title": "Old typewriter typing",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1372/1372-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/typing/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "typing",
   "mixkit_id": "2538",
   "title": "Hard laptop keyboard typing",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2538/2538-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/typing/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "typing",
   "mixkit_id": "1387",
   "title": "Fast keyboard typing",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1387/1387-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/typing/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "pop",
   "mixkit_id": "2925",
   "title": "Soap bubble sound",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2925/2925-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/pop/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "riser",
   "mixkit_id": "790",
   "title": "Cinematic trailer riser",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/790/790-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/riser/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "riser",
   "mixkit_id": "2719",
   "title": "Cinematic riser helicopter engine",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/2719/2719-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/riser/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "riser",
   "mixkit_id": "794",
   "title": "Tech choir cinematic riser",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/794/794-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/riser/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "riser",
   "mixkit_id": "1144",
   "title": "Short space stutter intro riser",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1144/1144-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/riser/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "riser",
   "mixkit_id": "632",
   "title": "Cinematic drama riser",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/632/632-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/riser/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  },
  {
   "category": "impact",
   "mixkit_id": "1687",
   "title": "Dramatic metal explosion impact",
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1687/1687-preview.mp3",
   "source_page": "https://mixkit.co/free-sound-effects/impact/",
   "license": "Mixkit Sound Effects Free License",
   "license_url": "https://mixkit.co/license/#sfxFree",
   "bundled": false,
   "note": "Runtime download only."
  }
 ],
 "paths": "file paths are relative to this manifest",
 "default_kit": [
  {
   "category": "whoosh",
   "title": "Whoosh",
   "creator": "qubodup",
   "source": "Freesound (CC0)",
   "source_url": "https://freesound.org/people/qubodup/sounds/60013/",
   "license": "CC0 1.0",
   "credit": "\"Whoosh\" by qubodup (https://freesound.org/people/qubodup/sounds/60013/), CC0",
   "file": "kit/whoosh.ogg",
   "bundled": true
  },
  {
   "category": "click",
   "title": "Classic Click",
   "creator": "adh.dreaming",
   "source": "Freesound (CC0)",
   "source_url": "https://freesound.org/people/adh.dreaming/sounds/671105/",
   "license": "CC0 1.0",
   "credit": "\"Classic Click\" by adh.dreaming (https://freesound.org/people/adh.dreaming/sounds/671105/), CC0",
   "file": "kit/click.ogg",
   "bundled": true
  },
  {
   "category": "typing",
   "title": "Fast laptop keyboard typing",
   "creator": "Mixkit",
   "source": "Mixkit",
   "source_url": "https://mixkit.co/free-sound-effects/typing/",
   "license": "Mixkit SFX Free License (use in videos OK; no redistribution)",
   "credit": "\"Fast laptop keyboard typing\" by Mixkit (https://mixkit.co/free-sound-effects/typing/), Mixkit Free License",
   "file": null,
   "bundled": false,
   "runtime_url": "https://assets.mixkit.co/active_storage/sfx/1392/1392-preview.mp3",
   "download_to": "sound-effects-cache/typing.mp3",
   "note": "Mixkit: download at runtime into the user project; never commit."
  },
  {
   "category": "pop",
   "title": "POP SFX Neutral",
   "creator": "ethernel0",
   "source": "Freesound (CC0)",
   "source_url": "https://freesound.org/people/ethernel0/sounds/776016/",
   "license": "CC0 1.0",
   "credit": "\"POP SFX Neutral\" by ethernel0 (https://freesound.org/people/ethernel0/sounds/776016/), CC0",
   "file": "kit/pop.ogg",
   "bundled": true
  },
  {
   "category": "riser",
   "title": "Cinematic Riser #3 subtle",
   "creator": "BeaconStudio",
   "source": "Freesound (CC0)",
   "source_url": "https://freesound.org/people/BeaconStudio/sounds/859482/",
   "license": "CC0 1.0",
   "credit": "\"Cinematic Riser #3 subtle\" by BeaconStudio (https://freesound.org/people/BeaconStudio/sounds/859482/), CC0",
   "file": "kit/riser.ogg",
   "bundled": true
  },
  {
   "category": "impact",
   "title": "soft_impact3",
   "creator": "peoplearehappy",
   "source": "Freesound (CC0)",
   "source_url": "https://freesound.org/people/peoplearehappy/sounds/841274/",
   "license": "CC0 1.0",
   "credit": "\"soft_impact3\" by peoplearehappy (https://freesound.org/people/peoplearehappy/sounds/841274/), CC0",
   "file": "kit/impact.ogg",
   "bundled": true
  },
  {
   "category": "tick",
   "title": "Click / Tick",
   "creator": "Squirrel_404",
   "source": "Freesound (CC0)",
   "source_url": "https://freesound.org/people/Squirrel_404/sounds/683048/",
   "license": "CC0 1.0",
   "credit": "\"Click / Tick\" by Squirrel_404 (https://freesound.org/people/Squirrel_404/sounds/683048/), CC0",
   "file": "kit/tick.ogg",
   "bundled": true
  }
 ],
 "kit_note": "default_kit is used first (one sound per category, chosen by Bart 12 Oct 2026). Other bundled files are alternatives.",
 "alt_categories": {
  "tick": [
   "tick",
   "ui-blip",
   "click"
  ],
  "click": [
   "click",
   "tick"
  ],
  "pop": [
   "pop",
   "ding"
  ],
  "whoosh": [
   "whoosh",
   "transition"
  ],
  "riser": [
   "riser"
  ],
  "impact": [
   "impact"
  ],
  "typing": [
   "typing"
  ]
 },
 "originals_note": "Bundled files are compressed OGG previews. Every bundled and default_kit entry has source_url: the Freesound sound page (download the original from there, free account needed) or the Kenney pack page (the pack zip has the original files)."
}

# Licences

## Code and docs
The scripts and SKILL.md are licensed under the repo's licence. The sound-pass approach is credited to Vox (@Voxyz_ai).

## Bundled sound effects (`sfx/`): all CC0 1.0 (public domain dedication)
https://creativecommons.org/publicdomain/zero/1.0/. You may use, modify and redistribute them, including in monetised videos and inside this repo. Attribution is optional, but credit is given below.
- **Kenney** audio packs (Interface Sounds, UI Audio, Digital Audio, Impact Sounds, Sci-fi Sounds), https://kenney.nl/assets. Each pack's License.txt states CC0.
- **Freesound**: only sounds whose page shows CC0 were used, verified per sound on 12 Oct 2026. The files are Freesound's HQ previews of those sounds.

Changes made: leading silence trimmed, length capped (4 s; risers 6 s; ambience 20 s with fades), one-shots peak-normalised to -3 dBFS, ambience normalised to -35 LUFS, converted to 48 kHz WAV, then for this repo: trailing silence below -60 dB trimmed and encoded as OGG Vorbis (q4; ambience q3), mono where both channels were identical.

| File | Category | Seconds | Author | Source |
|---|---|---|---|---|
| kit/whoosh.ogg | whoosh | kit | qubodup | [source](https://freesound.org/people/qubodup/sounds/60013/) |
| kit/click.ogg | click | kit | adh.dreaming | [source](https://freesound.org/people/adh.dreaming/sounds/671105/) |
| runtime: https://assets.mixkit.co/active_storage/sfx/1392/1392-preview.mp3 | typing | kit | Mixkit | [source](https://mixkit.co/free-sound-effects/typing/) |
| kit/pop.ogg | pop | kit | ethernel0 | [source](https://freesound.org/people/ethernel0/sounds/776016/) |
| kit/riser.ogg | riser | kit | BeaconStudio | [source](https://freesound.org/people/BeaconStudio/sounds/859482/) |
| kit/impact.ogg | impact | kit | peoplearehappy | [source](https://freesound.org/people/peoplearehappy/sounds/841274/) |
| kit/tick.ogg | tick | kit | Squirrel_404 | [source](https://freesound.org/people/Squirrel_404/sounds/683048/) |
| whoosh/fs830856.ogg | whoosh | 0.35 | MeanRaccoon via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/MeanRaccoon/sounds/830856/) |
| whoosh/fs810485.ogg | whoosh | 0.58 | CVLTIV8R via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/CVLTIV8R/sounds/810485/) |
| whoosh/fs393811.ogg | whoosh | 0.2 | deleted_user_6479820 via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/deleted_user_6479820/sounds/393811/) |
| click/fs788933.ogg | click | 0.13 | Mediasaur via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/Mediasaur/sounds/788933/) |
| pop/fs527522.ogg | pop | 0.08 | Narjara via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/Narjara/sounds/527522/) |
| pop/fs323738.ogg | pop | 0.08 | Reitanna via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/Reitanna/sounds/323738/) |
| pop/fs202230.ogg | pop | 0.22 | deraj via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/deraj/sounds/202230/) |
| riser/fs867126.ogg | riser | 2.01 | Diim_1 via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/Diim_1/sounds/867126/) |
| impact/fs524817.ogg | impact | 0.66 | DeVern via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/DeVern/sounds/524817/) |
| impact/fs745291.ogg | impact | 0.29 | SamsterBirdies via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/SamsterBirdies/sounds/745291/) |
| tick/fs528561.ogg | tick | 0.11 | Jummit via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/Jummit/sounds/528561/) |
| tick/fs384187.ogg | tick | 0.13 | malle99 via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/malle99/sounds/384187/) |
| tick/fs721514.ogg | tick | 0.04 | BaggoNotes via Freesound (CC0; credit given voluntarily) | [source](https://freesound.org/people/BaggoNotes/sounds/721514/) |
| whoosh/fs-264777-swoosh.ogg | whoosh | 4.0 | Shinplaster via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Shinplaster/sounds/264777/) |
| whoosh/fs-169867-swoosh.ogg | whoosh | 2.21 | Halgrimm via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Halgrimm/sounds/169867/) |
| whoosh/fs-127197-fast-simple-chop-5-aif.ogg | whoosh | 0.48 | dave.des via Freesound (CC0; credit optional) | [source](https://freesound.org/people/dave.des/sounds/127197/) |
| whoosh/fs-683101-quick-woosh.ogg | whoosh | 1.86 | florianreichelt via Freesound (CC0; credit optional) | [source](https://freesound.org/people/florianreichelt/sounds/683101/) |
| pop/fs-447910-plop.ogg | pop | 0.24 | Breviceps via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Breviceps/sounds/447910/) |
| pop/fs-467951-ui-button-click.ogg | pop | 0.12 | benzix2 via Freesound (CC0; credit optional) | [source](https://freesound.org/people/benzix2/sounds/467951/) |
| pop/fs-258269-mouth-pop.ogg | pop | 0.32 | jcallison via Freesound (CC0; credit optional) | [source](https://freesound.org/people/jcallison/sounds/258269/) |
| pop/fs-514833-user-interface-menu-sounds-wav.ogg | pop | 4.0 | oussamaben via Freesound (CC0; credit optional) | [source](https://freesound.org/people/oussamaben/sounds/514833/) |
| pop/fs-824189-pop-in-sfx.ogg | pop | 0.45 | Sadiquecat via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Sadiquecat/sounds/824189/) |
| typing/fs-323432-typing.ogg | typing | 4.0 | Alivvie via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Alivvie/sounds/323432/) |
| typing/fs-79388-keyboard-typing-wav.ogg | typing | 4.0 | j1987 via Freesound (CC0; credit optional) | [source](https://freesound.org/people/j1987/sounds/79388/) |
| typing/fs-416777-digital-typing-wav.ogg | typing | 1.0 | Sky_Motion via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Sky_Motion/sounds/416777/) |
| typing/fs-511418-data-reveal-sound.ogg | typing | 2.03 | Sky_Motion via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Sky_Motion/sounds/511418/) |
| typing/fs-447909-keyboard-typing.ogg | typing | 3.8 | Breviceps via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Breviceps/sounds/447909/) |
| riser/fs-685256-riser-sound-effect-short-wav.ogg | riser | 2.46 | syntheffects via Freesound (CC0; credit optional) | [source](https://freesound.org/people/syntheffects/sounds/685256/) |
| riser/fs-396161-scary-hits-risers-001.ogg | riser | 6.0 | Xinematix via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Xinematix/sounds/396161/) |
| riser/fs-396160-scary-hits-risers-002.ogg | riser | 6.0 | Xinematix via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Xinematix/sounds/396160/) |
| riser/fs-174363-rewind.ogg | riser | 6.0 | kasa90 via Freesound (CC0; credit optional) | [source](https://freesound.org/people/kasa90/sounds/174363/) |
| riser/fs-464250-echo-chromatic-riser-wav.ogg | riser | 6.0 | DylanTheFish via Freesound (CC0; credit optional) | [source](https://freesound.org/people/DylanTheFish/sounds/464250/) |
| impact/fs-177242-cinematic-impact.ogg | impact | 4.0 | deleted_user_3277771 via Freesound (CC0; credit optional) | [source](https://freesound.org/people/deleted_user_3277771/sounds/177242/) |
| impact/fs-222517-dramatic-hit.ogg | impact | 4.0 | qubodup via Freesound (CC0; credit optional) | [source](https://freesound.org/people/qubodup/sounds/222517/) |
| impact/fs-347561-micheal-bay-hit.ogg | impact | 4.0 | Kinoton via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Kinoton/sounds/347561/) |
| ding/fs-349504-triangle-open-04.ogg | ding | 4.0 | cabled_mess via Freesound (CC0; credit optional) | [source](https://freesound.org/people/cabled_mess/sounds/349504/) |
| ding/fs-634690-lil-pip.ogg | ding | 0.07 | adh.dreaming via Freesound (CC0; credit optional) | [source](https://freesound.org/people/adh.dreaming/sounds/634690/) |
| ding/fs-571513-soft-notifications-bell-ding-d.ogg | ding | 0.76 | LegitCheese via Freesound (CC0; credit optional) | [source](https://freesound.org/people/LegitCheese/sounds/571513/) |
| transition/fs-702773-swipe-wav.ogg | transition | 0.84 | LilMati via Freesound (CC0; credit optional) | [source](https://freesound.org/people/LilMati/sounds/702773/) |
| transition/fs-786514-swoosh-v2.ogg | transition | 0.3 | migoreng1 via Freesound (CC0; credit optional) | [source](https://freesound.org/people/migoreng1/sounds/786514/) |
| transition/fs-856168-cyberpunk-glitch-hologram-tran.ogg | transition | 2.99 | brktkrgll via Freesound (CC0; credit optional) | [source](https://freesound.org/people/brktkrgll/sounds/856168/) |
| transition/fs-816262-broomstick-whoosh-3-quiet-okm1.ogg | transition | 0.41 | Sadiquecat via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Sadiquecat/sounds/816262/) |
| transition/fs-850347-swipe-various.ogg | transition | 4.0 | Gravy42 via Freesound (CC0; credit optional) | [source](https://freesound.org/people/Gravy42/sounds/850347/) |
| transition/fs-683096-woosh.ogg | transition | 1.59 | florianreichelt via Freesound (CC0; credit optional) | [source](https://freesound.org/people/florianreichelt/sounds/683096/) |
| glitch/fs-402451-fast-forward.ogg | glitch | 4.0 | plasterbrain via Freesound (CC0; credit optional) | [source](https://freesound.org/people/plasterbrain/sounds/402451/) |
| glitch/fs-339521-vhs-rewind-forward-and-eject.ogg | glitch | 4.0 | lucaslima via Freesound (CC0; credit optional) | [source](https://freesound.org/people/lucaslima/sounds/339521/) |
| glitch/fs-144546-touchs-wav.ogg | glitch | 4.0 | garogourou via Freesound (CC0; credit optional) | [source](https://freesound.org/people/garogourou/sounds/144546/) |
| ambience/fs-329533-room-tone-in-an-apartment-livi.ogg | ambience | 17.31 | leonelmail via Freesound (CC0; credit optional) | [source](https://freesound.org/people/leonelmail/sounds/329533/) |
| ambience/fs-426767-apartment-room-tone-wav.ogg | ambience | 20.0 | cMilan via Freesound (CC0; credit optional) | [source](https://freesound.org/people/cMilan/sounds/426767/) |
| ambience/fs-329569-roomtone-bedroom-yew.ogg | ambience | 20.0 | leonelmail via Freesound (CC0; credit optional) | [source](https://freesound.org/people/leonelmail/sounds/329569/) |
| click/kenney-interface-click-001.ogg | click | 0.1 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| click/kenney-interface-select-001.ogg | click | 0.04 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| click/kenney-interface-select-002.ogg | click | 0.04 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| click/kenney-interface-select-003.ogg | click | 0.37 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| click/kenney-interface-tick-001.ogg | click | 0.04 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| click/kenney-interface-toggle-001.ogg | click | 0.14 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| click/kenney-interface-toggle-002.ogg | click | 0.14 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| ui-blip/kenney-ui-rollover1.ogg | ui-blip | 0.22 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/ui-audio) |
| ui-blip/kenney-ui-rollover2.ogg | ui-blip | 0.05 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/ui-audio) |
| ui-blip/kenney-ui-rollover3.ogg | ui-blip | 0.07 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/ui-audio) |
| ui-blip/kenney-ui-rollover4.ogg | ui-blip | 0.07 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/ui-audio) |
| ui-blip/kenney-digital-twotone1.ogg | ui-blip | 0.61 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| ui-blip/kenney-digital-twotone2.ogg | ui-blip | 0.63 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| ui-blip/kenney-digital-threetone1.ogg | ui-blip | 0.76 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| ui-blip/kenney-digital-threetone2.ogg | ui-blip | 0.76 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| ui-blip/kenney-digital-pepsound1.ogg | ui-blip | 0.4 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| ui-blip/kenney-digital-pepsound2.ogg | ui-blip | 0.45 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| ui-blip/kenney-digital-pepsound3.ogg | ui-blip | 0.36 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| glitch/kenney-interface-glitch-002.ogg | glitch | 0.03 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| glitch/kenney-sci-computernoise-000.ogg | glitch | 4.0 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/sci-fi-sounds) |
| glitch/kenney-sci-computernoise-001.ogg | glitch | 4.0 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/sci-fi-sounds) |
| glitch/kenney-sci-computernoise-002.ogg | glitch | 4.0 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/sci-fi-sounds) |
| impact/kenney-impact-impactpunch-heavy-000.ogg | impact | 0.65 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/impact-sounds) |
| impact/kenney-impact-impactpunch-heavy-001.ogg | impact | 0.54 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/impact-sounds) |
| impact/kenney-impact-impactsoft-heavy-000.ogg | impact | 0.53 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/impact-sounds) |
| impact/kenney-impact-impactsoft-heavy-001.ogg | impact | 0.57 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/impact-sounds) |
| impact/kenney-sci-lowfrequency-explosion-000.ogg | impact | 1.99 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/sci-fi-sounds) |
| impact/kenney-sci-lowfrequency-explosion-001.ogg | impact | 0.99 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/sci-fi-sounds) |
| ding/kenney-interface-confirmation-001.ogg | ding | 0.29 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| ding/kenney-interface-confirmation-002.ogg | ding | 0.54 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| ding/kenney-interface-confirmation-003.ogg | ding | 0.32 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| ding/kenney-interface-bong-001.ogg | ding | 0.12 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| ding/kenney-interface-glass-001.ogg | ding | 0.28 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| ding/kenney-interface-glass-002.ogg | ding | 0.12 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| pop/kenney-interface-drop-001.ogg | pop | 0.13 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| pop/kenney-interface-drop-002.ogg | pop | 0.19 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| pop/kenney-interface-drop-003.ogg | pop | 0.19 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| pop/kenney-interface-pluck-001.ogg | pop | 0.1 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| pop/kenney-interface-pluck-002.ogg | pop | 0.16 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| pop/kenney-interface-maximize-001.ogg | pop | 0.25 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| pop/kenney-interface-maximize-002.ogg | pop | 0.25 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| transition/kenney-interface-maximize-005.ogg | transition | 0.5 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| transition/kenney-interface-maximize-006.ogg | transition | 0.38 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| transition/kenney-interface-minimize-001.ogg | transition | 0.26 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| transition/kenney-interface-minimize-002.ogg | transition | 0.26 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| transition/kenney-interface-scroll-001.ogg | transition | 1.0 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| transition/kenney-interface-scroll-002.ogg | transition | 1.0 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/interface-sounds) |
| riser/kenney-digital-phaserup1.ogg | riser | 0.42 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| riser/kenney-digital-phaserup2.ogg | riser | 0.33 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| riser/kenney-digital-phaserup3.ogg | riser | 0.46 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| riser/kenney-digital-powerup1.ogg | riser | 1.11 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| riser/kenney-digital-powerup2.ogg | riser | 0.35 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |
| riser/kenney-digital-powerup3.ogg | riser | 1.01 | Kenney (kenney.nl), CC0; credit optional | [source](https://kenney.nl/assets/digital-audio) |

## Runtime-only sources (NOT bundled)
- **Mixkit Sound Effects Free License** (https://mixkit.co/license/#sfxFree): you can use it in commercial videos, including monetised YouTube, with no attribution. Standalone redistribution of the files is not allowed, so the skill downloads them into your project at runtime. The URLs are under `runtime` in the manifest.

## Sources checked but not bundled
- **Pixabay sounds**: free for commercial use with no attribution, but it bans standalone distribution, so it can't be bundled. Pixabay also blocks non-browser downloads. https://pixabay.com/service/license-summary/
- **Sonniss #GameAudioGDC bundles**: royalty-free, allowed in monetised YouTube, no attribution needed. Raw redistribution and AI/ML training are not allowed, so they can't be bundled. Use them locally only. https://sonniss.com/gdc-bundle-license/
- **YouTube Audio Library**: allowed in monetised YouTube videos, but standalone distribution is not, and it's only available inside YouTube Studio. Not bundled. https://support.google.com/youtube/answer/3376882
- **Freesound CC-BY / CC-BY-NC sounds**: excluded. BY needs attribution handling, and NC is not commercial.

# Top picks: sound effects for Claude motion graphics

Picked for Shorts, Reels and YouTube motion graphics, 12 Oct 2026. ★ marks the default kit sound the skill uses first. We credit every creator, including CC0 ones, because they made it.

Licences: **CC0** = public domain; bundled in this repo, credit optional. **Mixkit** = free for videos, including monetised YouTube and Instagram, but can't be redistributed, so the skill downloads it at runtime and it is never committed.

## whoosh

| | Sound | Creator | Licence | Source |
|---|---|---|---|---|
| ★ | Whoosh | qubodup | CC0 1.0 | https://freesound.org/people/qubodup/sounds/60013/ |
|  | Fast whoosh transition | Mixkit | Mixkit SFX Free License | https://mixkit.co/free-sound-effects/whoosh/ (Mixkit item #1490) |
|  | Arrow whoosh | Mixkit | Mixkit SFX Free License | https://mixkit.co/free-sound-effects/whoosh/ (Mixkit item #1491) |

## click

| | Sound | Creator | Licence | Source |
|---|---|---|---|---|
| ★ | Classic Click | adh.dreaming | CC0 1.0 | https://freesound.org/people/adh.dreaming/sounds/671105/ |
|  | kenney-interface-click-001.wav | Kenney | CC0 1.0 | https://kenney.nl/assets/interface-sounds |
|  | kenney-interface-select-001.wav | Kenney | CC0 1.0 | https://kenney.nl/assets/interface-sounds |

## typing

| | Sound | Creator | Licence | Source |
|---|---|---|---|---|
| ★ | Fast laptop keyboard typing | Mixkit | Mixkit SFX Free License | https://mixkit.co/free-sound-effects/typing/ (Mixkit item #1392) |
|  | Keyboard typing | Mixkit | Mixkit SFX Free License | https://mixkit.co/free-sound-effects/typing/ (Mixkit item #1386) |
|  | Slow typing on a keyboard | Mixkit | Mixkit SFX Free License | https://mixkit.co/free-sound-effects/typing/ (Mixkit item #2532) |

## pop

| | Sound | Creator | Licence | Source |
|---|---|---|---|---|
| ★ | POP SFX Neutral | ethernel0 | CC0 1.0 | https://freesound.org/people/ethernel0/sounds/776016/ |
|  | ppop.wav | Narjara | CC0 1.0 | https://freesound.org/people/Narjara/sounds/527522/ |
|  | Message pop alert | Mixkit | Mixkit SFX Free License | https://mixkit.co/free-sound-effects/pop/ (Mixkit item #2354) |

## riser

| | Sound | Creator | Licence | Source |
|---|---|---|---|---|
| ★ | Cinematic Riser #3 subtle | BeaconStudio | CC0 1.0 | https://freesound.org/people/BeaconStudio/sounds/859482/ |
|  | Riser sound effect short.wav | syntheffects | CC0 1.0 | https://freesound.org/people/syntheffects/sounds/685256/ |
|  | Cinematic trailer riser | Mixkit | Mixkit SFX Free License | https://mixkit.co/free-sound-effects/riser/ (Mixkit item #790) |

## impact

| | Sound | Creator | Licence | Source |
|---|---|---|---|---|
| ★ | soft_impact3 | peoplearehappy | CC0 1.0 | https://freesound.org/people/peoplearehappy/sounds/841274/ |
|  | Cinematic whoosh deep impact | Mixkit | Mixkit SFX Free License | https://mixkit.co/free-sound-effects/impact/ (Mixkit item #1143) |
|  | Oil Drum Soft Impact.wav | DeVern | CC0 1.0 | https://freesound.org/people/DeVern/sounds/524817/ |

## tick

| | Sound | Creator | Licence | Source |
|---|---|---|---|---|
| ★ | Click / Tick | Squirrel_404 | CC0 1.0 | https://freesound.org/people/Squirrel_404/sounds/683048/ |
|  | Soft UI Button Click | Jummit | CC0 1.0 | https://freesound.org/people/Jummit/sounds/528561/ |
|  | Click Tick.wav | malle99 | CC0 1.0 | https://freesound.org/people/malle99/sounds/384187/ |

## Suggested credit line (description)

Sound effects: "Whoosh" by qubodup (https://freesound.org/people/qubodup/sounds/60013/), CC0; "Classic Click" by adh.dreaming (https://freesound.org/people/adh.dreaming/sounds/671105/), CC0; "Fast laptop keyboard typing" by Mixkit (https://mixkit.co/free-sound-effects/typing/), Mixkit Free License; "POP SFX Neutral" by ethernel0 (https://freesound.org/people/ethernel0/sounds/776016/), CC0; "Cinematic Riser #3 subtle" by BeaconStudio (https://freesound.org/people/BeaconStudio/sounds/859482/), CC0; "soft_impact3" by peoplearehappy (https://freesound.org/people/peoplearehappy/sounds/841274/), CC0; "Click / Tick" by Squirrel_404 (https://freesound.org/people/Squirrel_404/sounds/683048/), CC0. Sound-pass approach: Vox (@Voxyz_ai).

# Suggested music

Free tracks that suit Claude motion graphics, grouped by feel. All are from Mixkit under the **Mixkit Stock Music Free License** (checked 13 Oct 2026). They are **not** stored in this repo: download the one you pick into the user's project at runtime from `https://assets.mixkit.co/music/<id>/<id>.mp3` and never commit it.

Before using one, do the licence check in `SKILL.md` (step 0): open the source page, confirm the licence hasn't changed, and confirm the user's use case is allowed.

Pass the track to the script like this, so `SOUND.md` and `CREDITS.txt` record it:
```
--music-source '"Tech House vibes" by Alejandro Magaña (A. M.), Mixkit #130' --music-license "Mixkit Stock Music Free License"
```

## High energy (launches, hype reels, fast cuts)
| Mixkit # | Track | Artist | Length | Feel |
|---|---|---|---|---|
| 130 | Tech House vibes | Alejandro Magaña (A. M.) | 1:42 | house, bass and drums, about 122 BPM |
| 171 | Techno Fights | Alejandro Magaña (A. M.) | 1:49 | house, propulsive, restless |
| 132 | Hazy After Hours | Alejandro Magaña (A. M.) | 2:07 | house, relaxed groove |
| 702 | Pop 09 | Grigoriy Nuzhny | 1:08 | positive, futuristic |
| 1168 | Coffee or Tea | Michael Ramir C. | 2:05 | electronic, positive, futuristic |

## Clean product demos and tutorials
| Mixkit # | Track | Artist | Length | Feel |
|---|---|---|---|---|
| 834 | It's Love | Michael Ramir C. | 1:37 | corporate, uplifting |
| 732 | Pop Track 06 | Lily J | 1:54 | corporate, futuristic |
| 634 | Your Breath | Eugenio Mininni | 3:56 | corporate, positive |

## Calm explainers and B-roll
| Mixkit # | Track | Artist | Length | Feel |
|---|---|---|---|---|
| 419 | Pilates and Yoga | Arulo | 1:36 | ambient, calm |
| 517 | Jungle Voices | Diego Nava | 1:38 | electronic, relaxed |

## Teasers and tension
| Mixkit # | Track | Artist | Length | Feel |
|---|---|---|---|---|
| 140 | Cyberpunk City | Alejandro Magaña (A. M.) | 1:40 | mysterious, eerie |
| 723 | Other World | Lily J | 1:36 | chillout, tension |

Browse more on Mixkit's genre pages, for example `https://mixkit.co/free-stock-music/electronica/`. The number in a track's preview link (`assets.mixkit.co/music/<id>/…`) is its Mixkit #.

## What the Mixkit Stock Music Free License allows (as of 13 Oct 2026)
- **Allowed:** YouTube videos, social media posts (Instagram, TikTok and others), online ads, podcasts, education, commercial and non-commercial. No credit required.
- **Not allowed:** CDs or DVDs, TV or radio broadcast, video games, remixing it or putting it in a music-only track, claiming it as your own, or registering it with Content ID or any rights management service.
- If a platform claims it, Mixkit asks you to forward the claim to team@mixkit.co.
- Licence page: https://mixkit.co/license/#musicFree

## Other places to find music
Check each one's current terms against the user's use case before using it.
- **YouTube Audio Library** (YouTube Studio → Audio Library): free, for YouTube videos; some tracks need a credit line, shown next to the track.
- **Epidemic Sound**, **Artlist** and similar: paid subscriptions. The licence covers the channels and period of the user's subscription; ask the user if they have one.
- **The user's own track**: ask where it came from and what licence they have.

#!/usr/bin/env python3
"""Measured sound pass for a motion-graphics video.
Approach credit: Vox (@Voxyz_ai), x.com/Voxyz_ai/status/2109358372873183564
Usage: sound_pass.py --video silent.mp4 --cues cues.json --music track.mp3 --manifest ../sfx/manifest.json --out outdir
Needs ffmpeg, python libs: librosa soundfile numpy scipy matplotlib.
"""
import argparse,json,os,re,subprocess,random
import numpy as np,librosa,soundfile as sf
from scipy.signal import butter,sosfiltfilt,find_peaks
import matplotlib; matplotlib.use('Agg'); import matplotlib.pyplot as plt
SR=48000
ap=argparse.ArgumentParser()
for a in ['video','cues','music','manifest','out']: ap.add_argument('--'+a,required=True)
ap.add_argument('--music-db',type=float,default=-12.0)
ap.add_argument('--music-source',default=None,help='where the music came from (track, artist, link), for CREDITS.txt')
ap.add_argument('--music-license',default=None,help='the music licence the user confirmed, e.g. "Mixkit Stock Music Free License"')
ap.add_argument('--use-case',default=None,help='where the video will be published, e.g. "YouTube and Instagram"; checked against known licence limits')
ap.add_argument('--seed',type=int,default=7)
ap.add_argument('--swaps',default=None,help='swaps.json from report.html: {cue_index: file|runtime_url|"auto"}')
A=ap.parse_args(); os.makedirs(A.out,exist_ok=True); os.makedirs(f'{A.out}/checks',exist_ok=True)
random.seed(A.seed)
run=lambda c:subprocess.run(c,capture_output=True,text=True)
dur=float(run(['ffprobe','-v','error','-show_entries','format=duration','-of','csv=p=0',A.video]).stdout)
fps=eval(run(['ffprobe','-v','error','-select_streams','v:0','-show_entries','stream=r_frame_rate','-of','csv=p=0',A.video]).stdout.strip())
cues=json.load(open(A.cues)); man=json.load(open(A.manifest)); base=os.path.dirname(os.path.abspath(A.manifest))
log=[]
# 1. beat grid + sub-120Hz check
y,_=librosa.load(A.music,sr=SR,mono=True)
tempo,bf=librosa.beat.beat_track(y=y,sr=SR); beats=librosa.frames_to_time(bf,sr=SR); period=float(np.median(np.diff(beats)))
low=sosfiltfilt(butter(4,120,'low',fs=SR,output='sos'),y)
env=np.abs(low); hop=240; envd=env[:len(env)//hop*hop].reshape(-1,hop).max(1); te=np.arange(len(envd))*hop/SR
pk,_=find_peaks(envd,height=envd.max()*0.5,distance=int(period*0.6*SR/hop)); kicks=te[pk]
def offs(g): return np.array([kicks[np.argmin(np.abs(kicks-b))]-b for b in g if kicks.size])
o=offs(beats); med=float(np.median(o)) if o.size else 0.0
grid=beats.copy(); shifted=False
if abs(med)>0.03:
  grid=beats+med; shifted=True
log.append(f"librosa tempo {float(np.atleast_1d(tempo)[0]):.1f} BPM, beat period {period:.3f}s. Kicks (<120 Hz) vs librosa grid: median offset {med*1000:+.0f} ms -> {'SHIFTED whole grid' if shifted else 'grid OK'}.")
fig,ax=plt.subplots(2,1,figsize=(12,5),sharex=True); w=4*4*period; m=te<w
for a_,g,lab in [(ax[0],beats,'librosa grid'),(ax[1],grid,'checked grid')]:
  a_.plot(te[m],envd[m],lw=.8); [a_.axvline(b,color='r',lw=1) for b in g if b<w]; a_.set_title(f'{lab}: waveform <120 Hz vs beat lines (first 4 bars)')
plt.tight_layout(); plt.savefig(f'{A.out}/beatgrid.png',dpi=90); plt.close()
# 2. align music so hard cuts land on beats (can't change the animation -> move where the music starts)
hard=[c['t'] for c in cues if c['type'] in('scene_cut','reveal')]
best=None
for s in np.arange(0,min(period*8,len(y)/SR-dur),0.005):
  e=sum(min(abs((grid-s)-t)) for t in hard)
  if best is None or e<best[0]: best=(e,s)
mstart=float(best[1]); vgrid=grid-mstart
resid={t:float(min(abs(vgrid-t))) for t in hard}
log.append(f"Music starts {mstart:.3f}s into the track. Cut-to-beat error: "+', '.join(f'{t:.2f}s={r*1000:.0f}ms' for t,r in resid.items()))
# 3. choose one SFX per cue: default kit first, then swaps (--swaps), alternatives for the report
cmap=man['category_map']; lib={}
for e in man.get('bundled',[]): lib.setdefault(e['category'],[]).append({**e,'path':os.path.join(base,e['file'])})
for e in man.get('runtime',[]): lib.setdefault(e['category'],[]).append({**e,'path':None})
kit={e['category']:e for e in man.get('default_kit',[])}
cache=os.path.join(A.out,'sound-effects-cache'); os.makedirs(cache,exist_ok=True)
def fetch(e):
  if e.get('path') and os.path.exists(e['path']): return e['path']
  url=e.get('runtime_url'); f=os.path.join(cache,(e.get('category','x'))+'-'+os.path.basename(url))
  if not os.path.exists(f):
    r=run(['curl','-fsSL','-o',f,url])
    if r.returncode!=0:
      if os.path.exists(f): os.remove(f)
      raise SystemExit(f"Could not download runtime sound for '{e.get('category')}' from {url} (curl exit {r.returncode}: {r.stderr.strip()}). Check your connection, or pick a bundled sound via --swaps.")
  return f
def kit_entry(cat):
  k=kit.get(cat)
  if not k: return None
  return {**k,'path':os.path.join(base,k['file']) if k.get('file') else None}
def alts(cat):
  out=[]
  for c in man.get('alt_categories',{}).get(cat,[cat]): out+=lib.get(c,[])
  return out
swaps=json.load(open(A.swaps)) if A.swaps else {}
def pick(cat,want=None,idx=None):
  sw=swaps.get(str(idx))
  pool=alts(cat)
  if sw and sw!='auto':
    for e in pool+[kit_entry(cat)]:
      if e and (e.get('file')==sw or e.get('runtime_url')==sw): return e
  if sw=='auto' or not kit_entry(cat):
    c=[e for e in pool if not want or e.get('length') in (None,want)] or pool
    return random.choice(c)
  return kit_entry(cat)
mix=np.zeros((int(dur*SR)+SR,2),dtype=np.float32); placed=[]
def load(p):
  a,_=librosa.load(p,sr=SR,mono=False); a=np.atleast_2d(a)
  if a.shape[0]==1: a=np.vstack([a,a])
  return a.T
for idx,c in enumerate(cues):
  cat=cmap[c['type']]; want={'movement':'short','scene_cut':'short'}.get(c['type'])
  e=pick(cat,want,idx); a=load(fetch(e))
  gain=0.0; pre=0.0
  if c['type'] in('movement','scene_cut'): pre=2/fps; gain=-4
  if c['type']=='typing':
    need=int(c.get('dur',1)*SR); a=np.tile(a,(need//len(a)+1,1))[:need]; f=int(.05*SR); a[-f:]*=np.linspace(1,0,f)[:,None]; gain=-8
  if c['type']=='build_up':
    need=int(c.get('dur',.8)*SR); a=a[-need:] if len(a)>need else a; gain=-6; start=c['t']+c.get('dur',.8)-len(a)/SR
  else: start=c['t']-pre
  if c['type'] in('appear','click','hover_or_small_ui'): gain=-6
  i=max(0,int(start*SR)); a=a*10**(gain/20); n=min(len(a),len(mix)-i); mix[i:i+n]+=a[:n]
  placed.append({**c,'idx':idx,'category':cat,'sfx':e.get('file') or e.get('runtime_url'),'sfx_path':fetch(e),'source_url':e.get('source_url') or e.get('source_page'),'license':e.get('license'),'credit':e.get('credit') or e.get('attribution') or 'Mixkit','start':round(start,3),'gain_db':gain,'alternatives':[{'id':x.get('file') or x.get('runtime_url'),'play':(os.path.relpath(x['path'],A.out) if x.get('path') else x.get('runtime_url')),'source_url':x.get('source_url') or x.get('source_page'),'license':x.get('license'),'label':x.get('note') or x.get('title') or os.path.basename(x.get('file') or x.get('runtime_url'))} for x in alts(cat)][:12]})
# music bed
yt,_=librosa.load(A.music,sr=SR,mono=False); yt=np.atleast_2d(yt); yt=(np.vstack([yt,yt]) if yt.shape[0]==1 else yt).T
seg=yt[int(mstart*SR):int(mstart*SR)+len(mix)]; seg=seg*10**(A.music_db/20)
f=int(.6*SR); seg[-f:]*=np.linspace(1,0,f)[:,None]; mix[:len(seg)]+=seg
mix=mix[:int(dur*SR)]; sf.write(f'{A.out}/mix_raw.wav',mix,SR)
# 4. loudness: measure the exported MP4, adjust, repeat
def export(gain_db,limit):
  af=f"volume={gain_db}dB"+(f",alimiter=limit={limit}:level=false" if limit else "")
  run(['ffmpeg','-y','-v','error','-i',A.video,'-i',f'{A.out}/mix_raw.wav','-map','0:v','-map','1:a','-c:v','copy','-af',af,'-c:a','aac','-b:a','256k','-shortest',f'{A.out}/after.mp4'])
def measure(p,mono=False):
  cmd=['ffmpeg','-nostats','-i',p]+(['-ac','1'] if mono else [])+['-af','ebur128=peak=true','-f','null','-']
  o=run(cmd).stderr; I=float(re.findall(r'I:\s+([-\d.]+) LUFS',o)[-1]); P=float(re.findall(r'Peak:\s+([-\d.]+) dBFS',o)[-1]); return I,P
g=0.0; lim=False
for it in range(10):
  export(g,lim); I,P=measure(f'{A.out}/after.mp4'); log.append(f"pass {it+1}: gain {g:+.1f} dB, limiter {lim if lim else 'off'} -> {I:.1f} LUFS, true peak {P:.1f} dBFS")
  if abs(I+16)<=0.5 and P< -4: break
  if P>=-4: lim=round((lim or 0.6)*0.9,3)
  if abs(I+16)>0.5: g+=(-16-I)
Im,Pm=measure(f'{A.out}/after.mp4',mono=True)
log.append(f"FINAL after.mp4: {I:.1f} LUFS integrated, true peak {P:.1f} dBFS. Mono downmix: {Im:.1f} LUFS, peak {Pm:.1f} dBFS.")
# 5. proof: frames before/after each cue + waveform window
run(['ffmpeg','-y','-v','error','-i',f'{A.out}/after.mp4','-ac','1','-ar',str(SR),'/tmp/after_audio.wav']); au,_=librosa.load('/tmp/after_audio.wav',sr=SR,mono=True)
for k,c in enumerate(placed):
  for tag,dt in (('a',-0.1),('b',0.15)):
    run(['ffmpeg','-y','-v','error','-ss',f"{max(0,c['t']+dt):.3f}",'-i',f'{A.out}/after.mp4','-frames:v','1','-vf','scale=320:-1',f'/tmp/cue{k}{tag}.png'])
  fig,ax=plt.subplots(1,3,figsize=(12,2.6),gridspec_kw={'width_ratios':[1,1,2]})
  for j,tag in enumerate('ab'): ax[j].imshow(plt.imread(f'/tmp/cue{k}{tag}.png')); ax[j].axis('off'); ax[j].set_title(('before ' if tag=='a' else 'after ')+'cue')
  s0=max(0,c['t']-0.5); s1=min(dur,c['t']+0.8); seg=au[int(s0*SR):int(s1*SR)]
  ax[2].plot(np.linspace(s0,s1,len(seg)),seg,lw=.4); ax[2].axvline(c['t'],color='r'); ax[2].set_title(f"cue {k} @ {c['t']:.2f}s {c['type']} <- {os.path.basename(c['sfx'])}",fontsize=8)
  plt.tight_layout(); plt.savefig(f"{A.out}/checks/cue-{k:02d}.png",dpi=80); plt.close()
# credits + licence check: only CC0 and Mixkit Free License count as known free licences; anything else is named as unknown
allman={}
for e in man.get('bundled',[])+man.get('runtime',[])+man.get('default_kit',[]): allman[e.get('file') or e.get('runtime_url')]=e
def free(lic): l=(lic or ''); return 'CC0' in l or ('Mixkit' in l and 'Free License' in l and 'Restricted' not in l)
def credit_line(c):
  e=allman.get(c['sfx'],{}); lic=c.get('license') or e.get('license') or 'licence unknown'
  if e.get('title') and e.get('creator'): name,who,src=e['title'],e['creator'],e.get('source','Freesound').split(' (')[0]
  elif str(c['sfx']).startswith('http'): name,who,src='Mixkit #'+str(e.get('mixkit_id') or ''),'Mixkit','Mixkit'
  else:
    b=os.path.basename(c['sfx']).rsplit('.',1)[0]; kenney=b.startswith('kenney-')
    name=re.sub(r'^kenney-','',re.sub(r'^fs-?\d+-?','',b)).replace('-',' ').strip().capitalize() or 'Freesound '+(re.findall(r'\d+',b) or [''])[0]
    a=e.get('attribution') or ''; who='Kenney' if kenney else (a.split(' via ')[0].strip() or 'unknown creator'); src='kenney.nl' if kenney else (a.split(' via ')[1].split(' (')[0].strip() if ' via ' in a else 'unknown source')
  url=c.get('source_url') or e.get('source_url') or e.get('source_page'); ok=free(lic)
  return ok,name,who,lic,url,f'"{name}" by {who} ({src}), {lic.split(" (")[0]}'+('' if ok else ' - LICENCE UNKNOWN, check before publishing')+(f' - {url}' if url else '')
seen={}; unknown=[]
for c in placed:
  if c['sfx'] in seen: continue
  ok,name,who,lic,url,line=credit_line(c); seen[c['sfx']]=line
  if not ok: unknown.append(f'"{name}" by {who} ({url or "no source link"}): licence "{lic}" is not a known free licence')
music_line=(f"{A.music_source or os.path.basename(A.music)}, {A.music_license}" if A.music_license else f"{A.music_source or os.path.basename(A.music)} - LICENCE NOT CONFIRMED, add the track, artist and licence before publishing")
open(f'{A.out}/CREDITS.txt','w').write('Sound effects\n'+'\n'.join(seen.values())+'\n\nMusic\n'+music_line+'\n')
lic_report=(["All sound effects have a known free licence (CC0 or Mixkit Free License). Sources can change their terms; check the source pages now and then."] if not unknown else ["UNKNOWN LICENCES, do not publish until checked:"]+['  '+u for u in unknown])+[("Music licence: "+A.music_license) if A.music_license else "Music licence: NOT CONFIRMED. Ask the user where the track is from and what licence it has."]
# use case against the known limits of the sources (Claude still checks each source's current page, SKILL.md step 0)
uc=(A.use_case or '').lower(); conflicts=[]
if A.use_case:
  if 'mixkit' in ((A.music_license or '')+(A.music_source or '')).lower() and any(w in uc for w in ('tv','television','broadcast','radio','game','cd','dvd')):
    conflicts.append('Mixkit music is not allowed for TV/radio broadcast, video games or CDs/DVDs: pick another track.')
  if any('Mixkit' in str(c.get('license')) for c in placed) and any(w in uc for w in ('template','tool','asset pack','stock')):
    conflicts.append('Mixkit sounds cannot be redistributed inside a template or tool: swap them for CC0 sounds.')
lic_report.append(('Use case: '+A.use_case+(' - CONFLICT: '+' '.join(conflicts) if conflicts else ' - no conflict with the known licence limits; still check each source page today (SKILL.md step 0).')) if A.use_case else 'Use case: NOT GIVEN. Ask the user where the video will be published.')
# 6. five timestamps for a human with headphones (riskiest first)
risk=sorted(placed,key=lambda c:-(resid.get(c['t'],0)*10+{'typing':.5,'build_up':.4,'reveal':.3,'scene_cut':.2}.get(c['type'],0)))[:5]
ts=[f"{c['t']:.2f}s ({c['type']}: {c['desc']}) - check {'beat sync' if c['t'] in resid else 'level/feel'}" for c in sorted(risk,key=lambda c:c['t'])]
rep=["# SOUND.md (generated by sound_pass.py)","Approach: Vox (@Voxyz_ai) sound pass. Claude can't hear, so everything below is measured.","",f"Music: {music_line}","","## Licences"]+['- '+l for l in lic_report]+["- CREDITS.txt: optional, ready to paste into a YouTube, Instagram or TikTok description. CC0 sounds need no credit; the list doubles as proof of source if a platform flags the audio.","","## Log"]+['- '+l for l in log]+["","## Cues"]+[f"- {c['t']:.2f}s {c['type']} -> {c['sfx']} (start {c['start']}s, {c['gain_db']} dB)" for c in placed]+["","## Check these 5 with headphones"]+['- '+t for t in ts]+["","Not claiming it sounds good: listen to these."]
open(f'{A.out}/SOUND.md','w').write('\n'.join(rep)); print('\n'.join(rep))
import report; report.write(A.out,placed,A.video,I,P)

# sound-effects

<p align="center"><img src="../../docs/sound-effects.gif" width="80%" alt="Before and after: a silent explainer clip, then the same clip after the sound pass with its audio level meter moving"></p>

**Makes Claude's motion graphics sound like a real editor scored them, not cheap electronic beeps.** It's a measured sound pass with a free CC0 sound library built in.

Based on the sound-pass prompt by **Vox ([@Voxyz_ai](https://x.com/Voxyz_ai/status/2109358372873183564))**.

## What it does
1. Builds a cue list from your animation: cuts, pops, clicks, typing and reveals.
2. Finds the music's beats with librosa, then **checks the grid against the kick drums below 120 Hz** and shifts it if librosa locked onto the off-beat.
3. Lands cuts on the beat, by retiming the animation or moving where the music starts.
4. Places one real sound effect per cue from the bundled library: whoosh, transition, pop, click, typing, riser, impact, ding, glitch, UI blips and ambience.
5. Mixes to **-16 LUFS with true peaks below -4 dBFS, measured on the exported MP4**, and checks the mono downmix too.
6. Writes `report.html`, where you can hear each cue, swap sounds or let the model decide.
7. Proves it with frames and waveforms for each cue, plus 5 timestamps for you to check with headphones.

## What you get
The video with sound (`after.mp4`), a `report.html` where you can play every cue and swap sounds (or let the model decide), proof frames and waveforms for each cue, and 5 timestamps to check with headphones.

## The sounds
A 7-sound default kit plus 103 alternatives (whoosh, transition, pop, click, typing, riser, impact, ding, glitch, UI blips, ambience), all CC0 from Kenney and Freesound and bundled as small OGG files. The default typing sound and 40 optional extras come from Mixkit, which allows use in videos but not redistribution, so the skill downloads them into your project when needed and they're never stored in this repo. Every file's creator, source and licence is in [`LICENSES.md`](LICENSES.md).

## Use it
Run `npx skills add Barty-Bart/motion-graphics` and pick `sound-effects`, then ask Claude Code something like *"add sound effects to this video"*.

## How it measures
Claude can't hear, so this skill measures everything instead: it checks the music's beat grid against the kick drums, lands cuts on the beat, places one real sound effect per cue, and mixes to -16 LUFS measured on the exported MP4.

## Library
`sfx/` contains a 7-sound **default kit** (`sfx/kit/`, 6 CC0 files plus Mixkit typing fetched at runtime) and 103 CC0 alternatives, stored as small OGG Vorbis files (about 2.7 MB in total). Every bundled file is **CC0**, from Kenney and Freesound. `sfx/manifest.json` lists each file's category, duration, source URL and licence. There are also 40 optional Mixkit links that are downloaded at runtime and never stored in this repo. See `LICENSES.md`.

The bundled files are compressed OGG previews. If one sounds too rough, every entry in the manifest links to its original (Freesound or Kenney), and the skill can help you grab it. Ask for more sounds and it will search Freesound, Kenney, Mixkit and other free libraries and suggest options with their licences, checking each one against your use case first.

**Music:** `MUSIC.md` suggests free tracks by feel (high energy, product demo, calm, tension), all from Mixkit. They're downloaded into your project when picked, never stored in this repo.

## Install
```
npx skills add Barty-Bart/motion-graphics
```
Then ask Claude Code: "add sound effects to this video".
Requirements: ffmpeg and Python 3.10+. The skill installs librosa and its dependencies into a local venv.

## Licences
The bundled sounds are listed as CC0 (free, no credit needed) by their sources, Freesound and Kenney. The optional Mixkit sounds are under Mixkit's Free License, which allows monetised videos. Sources can change their terms, so check the source page now and then, especially before an important release. Music is your responsibility: use a track you have a licence for. If YouTube's Content ID claims a free sound by mistake, dispute it and link the source page (every sound's link is in `sfx/manifest.json`).

While editing, Claude asks where the video will be published (unless it's obvious), then opens the current licence page of every source actually used and checks two things: the terms haven't changed, and your use case is allowed (for example, Mixkit music is fine on YouTube and Instagram but not on TV or in a video game). Every run also names any sound whose licence isn't a known free one (CC0 or Mixkit Free License), and flags the music until you confirm its licence. It also writes `CREDITS.txt`, a paste-ready list of the sounds and music used. Credit is optional for CC0, but the list is handy for a YouTube, Instagram or TikTok description and proves where the audio came from if a platform ever flags it.

## Credits
- Default kit (short list): qubodup, adh.dreaming, ethernel0, BeaconStudio, peoplearehappy, Squirrel_404 and Mixkit; alternatives by Kenney and the Freesound creators listed in [`TOP-PICKS.md`](TOP-PICKS.md) and [`LICENSES.md`](LICENSES.md).

The top picks per category, with links, are in `TOP-PICKS.md`. Every file's source and licence is in `LICENSES.md`.

## Licence
Skill code: MIT. Sound effects in `sfx/`: CC0 1.0 (see [`LICENSES.md`](LICENSES.md)). Mixkit sounds are downloaded at runtime under the Mixkit Free License and never stored in this repo.