> ## Documentation Index > Fetch the complete documentation index at: https://docs.apistable.com/llms.txt > Use this file to discover all available pages before exploring further. # Extend music > Provide an audio ID and the point to continue from. For generated songs, select the source song’s model version. > Operations are enabled individually by server configuration. Disabled operations return 503 without a task. Music credit deduction is currently disabled. ## Using this operation Provide an audio ID and the point to continue from. For generated songs, select the source song’s model version. * 1. Prepare the fields shown in the example below. Replace sample URLs and IDs with resources you can access. * 2. Set model to suno\_extend and place the parameters inside input. Submit once and save the returned task\_id. * 3. Query the saved task or receive its callback. A processing result is not a reason to submit the operation again. * Read songs from result.data.data. Each song has its own APIstable id, which can be used as audio\_id in a later task. ## Create task Send model and input to the common task endpoint. callback\_url is an optional top-level public HTTPS address. All resource IDs are APIstable IDs owned by your account. Music credit deduction is currently disabled. ```json theme={null} { "model": "suno_extend", "input": { "model": "V6", "audio_id": "YOUR_AUDIO_ID", "continue_at": 60, "style": "Synth pop" } } ``` ## Acceptance response HTTP 200 confirms acceptance, not completion. Query GET /api/v1/tasks/\{task\_id} until data.status is succeeded or failed. Read data.result only after success; a failed task has its error in data.message. ```json theme={null} { "code": 200, "msg": "success", "data": { "task_id": "YOUR_TASK_ID" } } ``` ## Parameter reference | Field | Type | Required | Description and limits | | - | - | - | - | | lyrics | string | No / conditional | Lyrics, up to 5000 characters; used instead of prompt when present. maxLength: 5000 | | prompt | string | No / conditional | Fallback lyrics, up to 5000 characters; used only when lyrics is omitted. maxLength: 5000 | | style | string | No / conditional | Musical style, up to 1000 characters. Counts as one attachment in simple generation. maxLength: 1000 | | negative\_tags | string | No / conditional | Styles to exclude; required for adding instrumental backing or vocals. maxLength: 1000 | | vocal\_gender | string | No / conditional | m or f. A vocal tendency, not a guaranteed voice identity. When generating music, requires custom mode. values: m, f | | style\_weight | number | No / conditional | Style influence, 0–1 with at most two decimal places. When generating music, requires custom mode. min: 0; max: 1 | | weirdness\_constraint | number | No / conditional | Creativity constraint, 0–1 with at most two decimal places. When generating music, requires custom mode. min: 0; max: 1 | | audio\_weight | number | No / conditional | Audio influence, 0–1 with at most two decimal places. Generation requires custom, non-instrumental mode. min: 0; max: 1 | | variety | integer | No / conditional | Variety: integer 0–4, default 1 in custom generation. min: 0; max: 4 | | persona\_id | string | No / conditional | APIstable Voice or Persona ID; provider root and artist mapping remain server-side. maxLength: 200 | | persona\_model | string | No / conditional | style\_persona or voice\_persona; must match the resource's actual origin. values: style\_persona, voice\_persona | | max\_mode | boolean | No / conditional | PayAPI extension. Max mode may increase supplier cost. APIstable credit deduction is currently disabled. default: false | | model | string | Yes | Suno version: V6, V6\_MINI or V6\_WILD. Extension must match the generated source model. values: V6, V6\_MINI, V6\_WILD | | audio\_id | string | Yes | APIstable song ID belonging to your account. Cover/extend accept this ID only, without a source task\_id or external URL. maxLength: 200 | | instrumental | boolean | No / conditional | Generate instrumental music. Instrumental extensions omit prompt, lyrics and vocal\_gender. | | title | string | No / conditional | Title. Generate/cover: up to 80 characters; extend and other operations: up to 100. Required for custom generation. maxLength: 100 | | continue\_at | number | No / conditional | Extension start in seconds, at most two decimal places; greater than zero and strictly less than source duration. min: 0 | | source\_lyrics | string | No / conditional | Source lyrics used to align an extension, separate from the new lyrics. Defaults to the stored source lyrics when omitted. maxLength: 5000 | | result\_mode | string | No / conditional | Extension/replacement: full\_song (default) or segment. Added stem: mixed (default) or stem. Full/mixed results wait for assembly. values: full\_song, segment; default: full\_song | ## Inputs and limits The schema lists supported fields, types and basic limits. Also follow Important conditions: cross-field and source-resource checks are not fully represented in JSON Schema. Unknown parameters are rejected. URL fields accept public HTTPS URLs, never file objects. ```json theme={null} { "$schema": "https://json-schema.org/draft/2020-12/schema", "type": "object", "properties": { "lyrics": { "type": "string", "maxLength": 5000, "description": "Lyrics, up to 5000 characters; used instead of prompt when present." }, "prompt": { "type": "string", "maxLength": 5000, "description": "Fallback lyrics, up to 5000 characters; used only when lyrics is omitted." }, "style": { "type": "string", "maxLength": 1000, "description": "Musical style, up to 1000 characters. Counts as one attachment in simple generation." }, "negative_tags": { "type": "string", "maxLength": 1000, "description": "Styles to exclude; required for adding instrumental backing or vocals." }, "vocal_gender": { "type": "string", "enum": [ "m", "f" ], "description": "m or f. A vocal tendency, not a guaranteed voice identity. When generating music, requires custom mode." }, "style_weight": { "type": "number", "minimum": 0, "maximum": 1, "description": "Style influence, 0–1 with at most two decimal places. When generating music, requires custom mode." }, "weirdness_constraint": { "type": "number", "minimum": 0, "maximum": 1, "description": "Creativity constraint, 0–1 with at most two decimal places. When generating music, requires custom mode." }, "audio_weight": { "type": "number", "minimum": 0, "maximum": 1, "description": "Audio influence, 0–1 with at most two decimal places. Generation requires custom, non-instrumental mode." }, "variety": { "type": "integer", "minimum": 0, "maximum": 4, "description": "Variety: integer 0–4, default 1 in custom generation." }, "persona_id": { "type": "string", "minLength": 1, "maxLength": 200, "description": "APIstable Voice or Persona ID; provider root and artist mapping remain server-side." }, "persona_model": { "type": "string", "enum": [ "style_persona", "voice_persona" ], "description": "style_persona or voice_persona; must match the resource's actual origin." }, "max_mode": { "default": false, "type": "boolean", "description": "PayAPI extension. Max mode may increase supplier cost. APIstable credit deduction is currently disabled." }, "model": { "type": "string", "enum": [ "V6", "V6_MINI", "V6_WILD" ], "description": "Suno version: V6, V6_MINI or V6_WILD. Extension must match the generated source model." }, "audio_id": { "type": "string", "minLength": 1, "maxLength": 200, "description": "APIstable song ID belonging to your account. Cover/extend accept this ID only, without a source task_id or external URL." }, "instrumental": { "type": "boolean", "description": "Generate instrumental music. Instrumental extensions omit prompt, lyrics and vocal_gender." }, "title": { "type": "string", "maxLength": 100, "description": "Title. Generate/cover: up to 80 characters; extend and other operations: up to 100. Required for custom generation." }, "continue_at": { "type": "number", "minimum": 0, "description": "Extension start in seconds, at most two decimal places; greater than zero and strictly less than source duration." }, "source_lyrics": { "type": "string", "maxLength": 5000, "description": "Source lyrics used to align an extension, separate from the new lyrics. Defaults to the stored source lyrics when omitted." }, "result_mode": { "default": "full_song", "type": "string", "enum": [ "full_song", "segment" ], "description": "Extension/replacement: full_song (default) or segment. Added stem: mixed (default) or stem. Full/mixed results wait for assembly." } }, "required": [ "model", "audio_id" ], "additionalProperties": false } ``` ## Important conditions * Use audio\_id only, without an external URL or source task\_id. For generated sources, model must match the source version. If supplied, continue\_at must be greater than zero and less than the source duration, with at most two decimal places. An instrumental extension must omit lyrics, prompt and vocal\_gender. * Song-generated Voice Personas currently support generation only; using one for cover/extend returns 42201. This restriction is distinct from a verified Voice created from your recording. If persona\_model is supplied, it must match the referenced resource. * full\_song/mixed results wait for assembly; segment/stem returns the requested part. An assembly failure is not reported as a complete song. Partial song success is identified by the result message. * Song audio may be MP3 or M4A. Use suno\_export\_mp3 for an actual MP3 file. Unavailable optional cover art may be null; audio remains usable. * Uploaded files last 24 hours, generated files 14 days and task details 30 days. Reused files keep their original expiry. Valid Voice/Persona identity mappings are separate from task-log cleanup. Download files you need to retain. ## Result schema The creation response is \{code:200,msg:"success",data:\{task\_id}}. Poll GET /api/v1/tasks/\{task\_id}. On success, data.result is an object matching the schema below; it is otherwise null. input remains a JSON string. ```json theme={null} { "type": "object", "required": [ "code", "msg", "data" ], "properties": { "code": { "const": 200 }, "msg": { "type": "string" }, "data": { "type": "object", "required": [ "callbackType", "task_id", "data" ], "properties": { "callbackType": { "const": "complete" }, "task_id": { "type": "string" }, "data": { "type": "array", "items": { "type": "object", "required": [ "id", "audio_url", "stream_audio_url", "image_url", "prompt", "lyrics", "model_name", "title", "createTime", "duration", "tags", "source_audio_url", "source_image_url", "source_stream_audio_url" ], "properties": { "id": { "type": "string" }, "audio_url": { "type": "string" }, "stream_audio_url": { "type": [ "string", "null" ] }, "image_url": { "type": [ "string", "null" ] }, "prompt": { "type": "string" }, "lyrics": { "type": [ "string", "null" ] }, "model_name": { "type": [ "string", "null" ] }, "title": { "type": [ "string", "null" ] }, "createTime": { "type": [ "integer", "null" ] }, "duration": { "type": [ "number", "null" ] }, "tags": { "type": [ "string", "null" ] }, "source_audio_url": { "type": "string" }, "source_image_url": { "type": [ "string", "null" ] }, "source_stream_audio_url": { "type": [ "string", "null" ] } } } } } } } } ``` > Song duration is in seconds; task duration is in milliseconds. createTime is a Unix timestamp in milliseconds or null. Current stream\_audio\_url and source\_stream\_audio\_url are null. source\_audio\_url/source\_image\_url refer to the same APIstable-hosted copies as audio\_url/image\_url, not provider links. Process the actual song array; upload registration does not imply two newly generated songs. ## Related workflows [Voice: all four steps](https://docs.apistable.com/en/suno-voice-workflow.md) [File uploads](https://docs.apistable.com/en/file-upload.md) [Callbacks](https://docs.apistable.com/en/webhooks.md) ## OpenAPI ````yaml openapi-suno-extend.json POST /api/v1/tasks/create_task openapi: 3.1.0 info: title: APIstable API version: 1.0.0-preview description: >- Public /api/v1 protocol. Valid API keys have the same account-scoped access. No client submission idempotency or max_credits. Enabled Suno operations use PayAPI and durable task processing. Media uses R2: uploads 24 hours, generated files 14 days, task logs 30 days. Music credit deduction is disabled. Unconfigured operations and LLM return 503. servers: - url: https://apistable.com description: APIstable API security: [] paths: /api/v1/tasks/create_task: post: summary: Extend music description: >- Provide an audio ID and the point to continue from. For generated songs, select the source song’s model version. operationId: suno_extend requestBody: required: true content: application/json: schema: type: object required: - model - input additionalProperties: false properties: model: type: string enum: - suno_extend example: suno_extend input: $schema: https://json-schema.org/draft/2020-12/schema type: object properties: lyrics: type: string maxLength: 5000 description: >- Lyrics, up to 5000 characters; used instead of prompt when present. prompt: type: string maxLength: 5000 description: >- Fallback lyrics, up to 5000 characters; used only when lyrics is omitted. style: type: string maxLength: 1000 description: >- Musical style, up to 1000 characters. Counts as one attachment in simple generation. negative_tags: type: string maxLength: 1000 description: >- Styles to exclude; required for adding instrumental backing or vocals. vocal_gender: type: string enum: - m - f description: >- m or f. A vocal tendency, not a guaranteed voice identity. When generating music, requires custom mode. style_weight: type: number minimum: 0 maximum: 1 description: >- Style influence, 0–1 with at most two decimal places. When generating music, requires custom mode. weirdness_constraint: type: number minimum: 0 maximum: 1 description: >- Creativity constraint, 0–1 with at most two decimal places. When generating music, requires custom mode. audio_weight: type: number minimum: 0 maximum: 1 description: >- Audio influence, 0–1 with at most two decimal places. Generation requires custom, non-instrumental mode. variety: type: integer minimum: 0 maximum: 4 description: 'Variety: integer 0–4, default 1 in custom generation.' persona_id: type: string minLength: 1 maxLength: 200 description: >- APIstable Voice or Persona ID; provider root and artist mapping remain server-side. persona_model: type: string enum: - style_persona - voice_persona description: >- style_persona or voice_persona; must match the resource's actual origin. max_mode: default: false type: boolean description: >- PayAPI extension. Max mode may increase supplier cost. APIstable credit deduction is currently disabled. model: type: string enum: - V6 - V6_MINI - V6_WILD description: >- Suno version: V6, V6_MINI or V6_WILD. Extension must match the generated source model. audio_id: type: string minLength: 1 maxLength: 200 description: >- APIstable song ID belonging to your account. Cover/extend accept this ID only, without a source task_id or external URL. instrumental: type: boolean description: >- Generate instrumental music. Instrumental extensions omit prompt, lyrics and vocal_gender. title: type: string maxLength: 100 description: >- Title. Generate/cover: up to 80 characters; extend and other operations: up to 100. Required for custom generation. continue_at: type: number minimum: 0 description: >- Extension start in seconds, at most two decimal places; greater than zero and strictly less than source duration. source_lyrics: type: string maxLength: 5000 description: >- Source lyrics used to align an extension, separate from the new lyrics. Defaults to the stored source lyrics when omitted. result_mode: default: full_song type: string enum: - full_song - segment description: >- Extension/replacement: full_song (default) or segment. Added stem: mixed (default) or stem. Full/mixed results wait for assembly. required: - model - audio_id additionalProperties: false callback_url: type: string format: uri description: >- Optional public HTTPS endpoint for signed completion callbacks; no redirects or private IPs. example: model: suno_extend input: model: V6 audio_id: YOUR_AUDIO_ID continue_at: 60 style: Synth pop responses: '200': description: Accepted task. Poll the common task endpoint or use callback_url. content: application/json: schema: type: object required: - code - msg - data additionalProperties: false properties: code: const: 200 msg: const: success data: type: object required: - task_id additionalProperties: false properties: task_id: type: string '400': description: >- 40001 invalid JSON, 40002 invalid input/callback, 40003 unsupported parameter. content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Invalid or revoked API key. content: application/json: schema: $ref: '#/components/schemas/Error' '402': description: '40201: Insufficient credits (live acceptance).' content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: '40401: Unknown model or resource not found in this account.' content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: '40901: Resource belongs to a different provider account.' content: application/json: schema: $ref: '#/components/schemas/Error' '410': description: '41001: Source audio or temporary resource has expired.' content: application/json: schema: $ref: '#/components/schemas/Error' '413': description: '41301: Request too large.' content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: '42201: Requested music combination is not enabled.' content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: '42901: Rate/concurrency limit (live acceptance).' content: application/json: schema: $ref: '#/components/schemas/Error' '503': description: '50301: Service/provider unavailable. No live submission or charge.' content: application/json: schema: $ref: '#/components/schemas/Error' security: - bearerAuth: [] components: schemas: Error: type: object required: - code - msg - data properties: code: type: integer msg: type: string data: type: 'null' securitySchemes: bearerAuth: type: http scheme: bearer description: >- Every valid key can submit and query its own account. Revoked keys are rejected. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.