AugmentClaude
VideoWriting

Audio Track

By ucsandman· ucsandman/marketing-studio· 0

Generate music, voiceovers, and soundtracks for videos or standalone audio files.

Installation

  1. Make sure Claude is on your device and in your terminal.

    Skills load from ~/.claude/skills/ when Claude Code starts up — so you need it on your machine first. If you don't have it yet, install it once with the command below, then run claude in any terminal to verify.

    One-time setup
    npm i -g @anthropic-ai/claude-code

    Already have it? Skip ahead.

  2. Paste into Claude Code or into your terminal.
    Install
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    This copies the whole skill folder into ~/.claude/skills/audio-track-ucsandman/ — the SKILL.md plus any scripts, reference docs, or templates the skill ships with. Safe default: works for every skill.

    Faster alternative (instruction-only skills)

    Skips the clone and grabs only the SKILL.md file. Don't use this if the skill ships Python scripts, reference markdowns, or asset templates — they won't be downloaded and the skill will fail when it tries to load them.

    Quick install (SKILL.md only)
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  3. Restart Claude Code.

    Quit and reopen Claude Code (or any other agent that loads from ~/.claude/skills/). New skills are picked up on startup.

  4. Just ask Claude.

    Skills auto-activate when your request matches the skill's description — no slash command needed. Trigger phrases live in the skill's own frontmatter; you can read them in the “What this skill does” section above.

Prefer to read the source first? Open on GitHub.

When Claude uses it

Use when the user wants music, voiceover, narration, or a soundtrack added to a video asset, OR wants standalone generated audio for any purpose (e.g. "/audio-track", "add music to the launch video", "narrate the demo", "make a 30 second music sting", "generate a voiceover mp3", "jingle for the intro").

What this skill does

Audio Track

REQUIRED BACKGROUND: marketing-studio skill. Work in ${CLAUDE_SKILL_DIR}/../... Read the PLAYBOOK's Audio section first (endpoints, ducking, manifest contract).

Two modes; pick by what the user wants:

  • Video soundtrack — the target composition re-rendered with music + voiceover (out/<brand>/<asset>-audio.mp4). Recipe A.
  • Standalone audio — a music track and/or narration mp3s delivered as files (a sting, a jingle, a narration for something outside this studio). Recipe B.

Both need ELEVENLABS_API_KEY in the repo .env (missing key = feeder exits 2; videos stay silent). Generation costs real money: one pass, trim copy rather than regenerate blindly. Free tier returns 402; Starter or above required.

Recipe A: video soundtrack

  1. Shared-repo guard + toolchain per marketing-studio.
  2. Copy source of truth: scripts/build-<brand>-audio.mjs (copy the noban one for a new brand). VO lines are keyed by act, written FOR THE EAR ("dot gg", not ".gg"), one line per act, terse. Music prompt describes the brand's sonic character.
  3. Run it: node scripts/build-<brand>-audio.mjs (music takes 1-3 min). Check every line's duration fits its act; trim TEXT if not, re-run with --force.
  4. Merge + render: node scripts/merge-launch-audio.mjs then render the composition with the merged props.
  5. Listen-proof: verify the mp4 has an audio stream (ffprobe), then SEND the video — audio is approved by ear, by the user. Ducking feel (base 0.35 / duck 0.12) is tunable in studio/src/lib/audioMix.ts if redlined.

Recipe B: standalone audio

  1. Shared-repo guard per marketing-studio (the feeder lives in the engine repo even for standalone output).
  2. Music: node feeders/audio/client.mjs music --prompt "<sonic character>" --length-ms <n> --out out/<brand>/<name>.mp3 (exact-length, commercially licensed on paid plans; 3s-120s). Voiceover: write {lines: [{id, text}]} to a temp JSON (text written for the ear), then node feeders/audio/client.mjs vo --script <json> --out out/<brand>/. Durations print as ... OK: <name> <ms>ms; probe --file <mp3> re-measures.
  3. Listen-proof: SEND the mp3(s) to the user, then copy approved files into the calling repo per the marketing-studio delivery contract.

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