Audio Ducking

What it does

When your agent uses it

• Mixing a separately-generated
• Existing music track under narration
• A videos own voice track
• Without manual volume automation

Example prompts

• “/audio-ducking”

Requirements

• Python 3
• Node.js
• A credential in SONILO_API_KEY
• Compatibility (from SKILL.md): Requires Sonilo through either transport — the MCP server connected, or the `sonilo` CLI installed and signed in — plus credentials: a `sonilo login` sign-in, the hosted OAuth plugin, or SONILO_API_KEY. See the setup-api-key skill.
• Pre-approved tools (allowed-tools): Bash, Read, Write, mcp__sonilo__*

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

1. 1Sonilo MCP tools visible in this session (audio_ducking and friends) — use them. This is the preferred path: it needs no shell, and it is…
2. 2No usable Sonilo MCP tools, but sonilo account exits 0 — use the CLI commands below. Same API, same account, same credential file. Probe…
3. 3Neither — stop and run the setup-api-key skill. Do not call api.sonilo.com with curl to work around it; both transports handle uploads…

What it can do on your machine

Read from SKILL.md and the folder at commit 1ce1bd8. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash
  • Read
  • Write
  • mcp__sonilo__*

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • pip
  • npm
  • curl

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • api.sonilo.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • SONILO_API_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Requires Sonilo through either transport — the MCP server connected, or the `sonilo` CLI installed and signed in — plus credentials: a `sonilo login` sign-in, the hosted OAuth plugin, or SONILO_API_KEY. See the setup-api-key skill.

  From compatibility in the SKILL.md frontmatter.

Context cost

Audio Ducking loads about 1.8k tokens when it runs. Until then it costs about 77 tokens; SKILL.md has 722 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~77

When it runs · the whole SKILL.md, loaded when a task matches

~1.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Bash, Read, Write, mcp__sonilo__*

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from sonilo-ai/skills at commit 1ce1bd8, republished under its MIT licence (© sonilo-ai). 722 words, ~1,752 tokens.

name

audio-ducking

description

Duck a music bed under a voice track using Sonilo — automatically lowers the music wherever the voice speaks and lifts it back in the gaps. Use when mixing a separately-generated or existing music track under narration, dialogue, or a video's own voice track, without manual volume automation.

allowed-tools

Bash, Read, Write, mcp__sonilo__*

compatibility

Requires Sonilo through either transport — the MCP server connected, or the `sonilo` CLI installed and signed in — plus credentials: a `sonilo login` sign-in, the hosted OAuth plugin, or SONILO_API_KEY. See the setup-api-key skill.

license

MIT

audio_ducking(
    voice_path="~/Desktop/interview.mp4",
    music_path="~/Desktop/background-track.wav"
)

from sonilo import Sonilo

client = Sonilo()  # reads SONILO_API_KEY

result = client.audio_ducking.generate(
    voice="interview.mp4",  # audio or video; also voice_url=
    music="background-track.wav",  # audio only; also music_url=
)
result.save("ducked.mp4" if result.output_type == "video" else "ducked.wav")

import { SoniloClient, download } from "sonilo";
import { writeFile } from "node:fs/promises";

const client = new SoniloClient(); // reads SONILO_API_KEY

const result = await client.audioDucking.generate({
  voice: "./interview.mp4", // audio or video; also voiceUrl
  musicUrl: "https://example.com/background-track.wav", // audio only; also music
});
await writeFile(
  result.output_type === "video" ? "ducked.mp4" : "ducked.wav",
  await download(result.output_url!),
);

sonilo audio-ducking --voice interview.mp4 --music-url https://example.com/background-track.wav

curl -X POST "https://api.sonilo.com/v1/audio-ducking" \
  -H "Authorization: Bearer $SONILO_API_KEY" \
  -F "voice_file=@interview.mp4" \
  -F "music_file=@background-track.wav"
# -> {"task_id": "..."}  poll GET /v1/tasks/{task_id}

© sonilo-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in audio-ducking of sonilo-ai/skills.

Open the folder on GitHubat commit 1ce1bd8