> ## Documentation Index > Fetch the complete documentation index at: https://apidoc.cometapi.com/llms.txt > Use this file to discover all available pages before exploring further. # Isolate a Runway voice > Separate speech from background audio with the Runway API. Use `POST /runwayml/v1/voice_isolation` to separate speech from background audio. Use the model ID `eleven_voice_isolation`. Send your CometAPI API key with Bearer authentication and a JSON request body. ## Provide source audio The request requires `model` and `audioUri`. Set `audioUri` to an accessible HTTPS URL of the recording that contains the speech to isolate. Replace the example audio URL with your source file. ## Retrieve the result Save the returned `id`, then use [Get a Runway task](./runway-to-get-task-details) to retrieve task status. When `status` is `SUCCEEDED`, read the audio URLs in `output`. If the task fails, inspect `failure` and `failureCode`. ## OpenAPI ````yaml api/openapi/video/runway/official-format/post-isolate-voice.openapi.json POST /runwayml/v1/voice_isolation openapi: 3.1.0 info: title: Isolate a Runway voice API version: 1.0.0 description: Separate speech from background audio with the Runway API. servers: - url: https://api.cometapi.com security: - bearerAuth: [] paths: /runwayml/v1/voice_isolation: post: summary: Isolate a Runway voice description: >- Separate speech from background audio with the Runway API. Save the returned id and retrieve the task to obtain its output. operationId: runway_voice_isolation requestBody: required: true content: application/json: schema: title: eleven_voice_isolation type: object properties: model: type: string const: eleven_voice_isolation enum: - eleven_voice_isolation description: Model ID for this request. audioUri: description: Audio input as an accessible HTTPS URL or base64 data URI. anyOf: - description: Accessible HTTPS URL of the audio file. type: string minLength: 13 maxLength: 2048 pattern: ^https:\/\/.* - description: Base64 audio data URI, up to 5 MB. type: string minLength: 13 maxLength: 5242880 pattern: ^data:audio\/.* required: - audioUri - model additionalProperties: false description: Request settings for eleven_voice_isolation. default: model: eleven_voice_isolation audioUri: https://your-audio-host/source-speech.mp3 examples: eleven_voice_isolation: summary: eleven_voice_isolation value: model: eleven_voice_isolation audioUri: https://your-audio-host/source-speech.mp3 responses: '200': description: Task created. Save the returned id to retrieve task status. content: application/json: schema: type: object properties: id: type: string description: Task ID for GET /runwayml/v1/tasks/{id}. status: type: string description: Task state, when returned. createdAt: type: string description: Task submission timestamp, when returned. format: date-time output: type: array description: Result URLs, when returned. items: type: string format: uri failure: type: string description: Failure explanation, when returned. failureCode: type: string description: Machine-readable failure code, when returned. estimatedCost: type: object description: Task estimate metadata, when returned. properties: credits: type: integer description: Credit value reported with the task. required: - credits additionalProperties: false cost: type: object description: Task cost metadata, when returned. properties: credits: type: integer description: Credit value reported with the task. required: - credits additionalProperties: false required: - id additionalProperties: false example: id: 123e4567-e89b-42d3-a456-426614174000 '400': description: Invalid request or unavailable task ID. content: application/json: schema: oneOf: - type: object description: Task request error. properties: code: type: - string - integer description: Machine-readable task error code. message: type: string description: Error explanation. data: description: Additional error details, when returned. required: - code - message additionalProperties: true - type: object description: Request authentication or validation error. properties: error: type: object description: Error details. properties: message: type: string description: Error explanation. type: type: string description: Error category. code: type: - string - integer - 'null' description: Error code, when returned. required: - message additionalProperties: true required: - error additionalProperties: true '401': description: Authentication failed. content: application/json: schema: type: object description: Request authentication or validation error. properties: error: type: object description: Error details. properties: message: type: string description: Error explanation. type: type: string description: Error category. code: type: - string - integer - 'null' description: Error code, when returned. required: - message additionalProperties: true required: - error additionalProperties: true x-codeSamples: - lang: Shell label: eleven_voice_isolation source: | curl https://api.cometapi.com/runwayml/v1/voice_isolation \ --request POST \ --header "Authorization: Bearer $COMETAPI_KEY" \ --header "Content-Type: application/json" \ --data '{ "model": "eleven_voice_isolation", "audioUri": "https://your-audio-host/source-speech.mp3" }' - lang: Python label: eleven_voice_isolation source: | import os import requests payload = { 'model': 'eleven_voice_isolation', 'audioUri': 'https://your-audio-host/source-speech.mp3'} response = requests.post( "https://api.cometapi.com/runwayml/v1/voice_isolation", headers={"Authorization": "Bearer " + os.environ["COMETAPI_KEY"]}, json=payload, ) response.raise_for_status() print(response.json()["id"]) - lang: JavaScript label: eleven_voice_isolation source: | const payload = { "model": "eleven_voice_isolation", "audioUri": "https://your-audio-host/source-speech.mp3" }; const response = await fetch( "https://api.cometapi.com/runwayml/v1/voice_isolation", { method: "POST", headers: { Authorization: `Bearer ${process.env.COMETAPI_KEY}`, "Content-Type": "application/json", }, body: JSON.stringify(payload), }, ); if (!response.ok) throw new Error(await response.text()); const task = await response.json(); console.log(task.id); components: securitySchemes: bearerAuth: type: http scheme: bearer description: Use your CometAPI API key. ````