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Halowerk Music Ducking (Sidechain Compression Mix)
x402
Halowerk Music Ducking (Sidechain Compression Mix) is a paid API for AI agents from medien.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-31).
Mixes a voice recording with a background music track using sidechain-style ducking — music lowers automatically when speech is present and returns during pauses — then normalises to a target loudness.
Price / call$0.004
Success—
StatusUnknown
How this service works
Takes a voice recording and a music track and returns one mix in which the music is lowered by sidechain compression whenever the voice is present and returns in pauses — the standard podcast and voice-over sound. The music is looped or trimmed to the voice length, starts at the chosen bed level and fades out at the end; the voice is levelled first. Depth of ducking and music level are selectable, and the mix is brought to the target loudness, measured afterwards.
Output
A single mixed audio file (MP3, WAV, FLAC, or Opus) in which the music track has been looped or trimmed to match the voice length, sidechain-ducked under speech, faded out at the end, and normalised to the specified LUFS target. The voice is levelled before mixing.
Example use cases
Podcast episode music bed
“I've got my podcast episode voice recording and a royalty-free music track. Can you mix them together so the music ducks under my voice when I'm speaking, keep the music at -12 dB, use a duck ratio of 8, and export as MP3 at -16 LUFS?”
YouTube voice-over background music
“I have a narration file and a background music clip for my YouTube video — please mix them so the music lowers whenever I'm speaking using a duck ratio of 10, set the bed at -15 dB, and target -14 LUFS in the output, in WAV format.”
Radio ad voice-over with music bed
“Take my 2-minute radio ad voice recording and this music track and produce a ducked mix — I want strong ducking with a ratio of 12 so the music really drops when the voice is on, music level at -10 dB, finalised to -16 LUFS as an MP3.”
Technical details
Endpoint
POSThttps://medien.halowerk.com/v1/music-ducking?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a ready-to-publish, broadcast-quality mix of a voice recording and a music bed with automatic sidechain-style ducking — particularly for podcasts, voice-overs, or radio ads — and you want configurable duck depth, music level, and loudness normalisation without running a local DAW or audio processing pipeline.
Side effects
- Voice or music file exceeds 24 MB upload / base64 limit — returns 400 or payload-too-large error
- Unsupported audio codec or format in the uploaded files — returns 422 with format error
- duck_ratio or music_level_db outside allowed range — returns 422 validation error
- target_lufs outside -24 to -12 range — returns 422 validation error
- duration_minutes exceeds 30 — returns 422 validation error
- Payment not included or insufficient — returns 402 Payment Required
- Source URL unreachable or returns non-audio content — returns 400 or 502
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| music | object | |
| voice | object | |
| duck_ratio | number | How strongly the music dips under speech. |
| target_lufs | number | |
| output_format | string | |
| music_level_db | number | Music level when nobody speaks, relative to the voice. |
| duration_minutes | integer | Length of the voice track in started minutes. |
Tags
x402
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