Isolate Audio

POST 
https://api.knoxstudio.ai/v1/audio-isolation

Isolate vocals/speech from mixed audio or video. Files up to 500MB, duration 100ms–1 hour. Billed at $0.17/minute. Guide: Voice Isolator.

Request

Request Headers

Name	Type	Required	Description
Authorization	String	Yes	Bearer <token> Knox API key. xi-api-key is also accepted.
Content-Type	String	Yes	multipart/form-data

Request Body

Name	Type	Required	Description
audio	File	Yes	Audio or video file to isolate speech from.
file_format	String	No	pcm_s16le_16 or other (encoded files such as MP3/WAV).
preview_b64	String	No	Optional preview payload; forwarded upstream.

cURL Example

curl -X POST https://api.knoxstudio.ai/v1/audio-isolation \
     -H "Authorization: Bearer $KNOXCHAT_API_KEY" \
     -F "audio=@interview.wav" \
     -F "file_format=other" \
     -o vocals.mp3

Response

Success Response (200)

The isolated audio file. Content-Type follows the upstream codec (typically MP3).

Error Responses

Validation uses HTTP 422:

{
  "detail": [
    {
      "loc": ["body", "field"],
      "msg": "…",
      "type": "value_error"
    }
  ]
}

Other errors use { "detail": "message" }.

Status	When
400	WebSocket path called without Upgrade: websocket.
401	Missing or invalid API key.
402	Insufficient credits.
403	Token is not allowed to use this model.
404	Resource not found.
422	Validation error.
429	Rate limit exceeded.
500	Internal server error.