Add instrumental backing

curl --request POST \
  --url https://apistable.com/api/v1/tasks/create_task \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "suno_add_instrumental",
  "input": {
    "upload_url": "https://example.com/vocals.wav",
    "title": "Backing",
    "tags": "Jazz trio",
    "negative_tags": "Distortion"
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    model: 'suno_add_instrumental',
    input: {
      upload_url: 'https://example.com/vocals.wav',
      title: 'Backing',
      tags: 'Jazz trio',
      negative_tags: 'Distortion'
    }
  })
};

fetch('https://apistable.com/api/v1/tasks/create_task', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://apistable.com/api/v1/tasks/create_task"

payload = {
    "model": "suno_add_instrumental",
    "input": {
        "upload_url": "https://example.com/vocals.wav",
        "title": "Backing",
        "tags": "Jazz trio",
        "negative_tags": "Distortion"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "code": 200,
  "msg": "success",
  "data": {
    "task_id": "<string>"
  }
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

POST

api

tasks

create_task

Add instrumental backing

curl --request POST \
  --url https://apistable.com/api/v1/tasks/create_task \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "suno_add_instrumental",
  "input": {
    "upload_url": "https://example.com/vocals.wav",
    "title": "Backing",
    "tags": "Jazz trio",
    "negative_tags": "Distortion"
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    model: 'suno_add_instrumental',
    input: {
      upload_url: 'https://example.com/vocals.wav',
      title: 'Backing',
      tags: 'Jazz trio',
      negative_tags: 'Distortion'
    }
  })
};

fetch('https://apistable.com/api/v1/tasks/create_task', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://apistable.com/api/v1/tasks/create_task"

payload = {
    "model": "suno_add_instrumental",
    "input": {
        "upload_url": "https://example.com/vocals.wav",
        "title": "Backing",
        "tags": "Jazz trio",
        "negative_tags": "Distortion"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "code": 200,
  "msg": "success",
  "data": {
    "task_id": "<string>"
  }
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

Operations are enabled individually by server configuration. Disabled operations return 503 without a task. Music credit deduction is currently disabled.

Using this operation

Start with a vocal audio URL and describe the backing arrangement to accompany it.

1. Prepare the fields shown in the example below. Replace sample URLs and IDs with resources you can access.
1. Set model to suno_add_instrumental and place the parameters inside input. Submit once and save the returned task_id.
1. 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.

{
  "model": "suno_add_instrumental",
  "input": {
    "upload_url": "https://example.com/vocals.wav",
    "title": "Backing",
    "tags": "Jazz trio",
    "negative_tags": "Distortion"
  }
}

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.

{
  "code": 200,
  "msg": "success",
  "data": {
    "task_id": "YOUR_TASK_ID"
  }
}

Parameter reference

Field	Type	Required	Description and limits
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
upload_url	string	Yes	Public HTTPS audio URL on port 443, without URL credentials. Use MP3/WAV/FLAC/OGG/M4A/AAC with a readable audio track. See the operation size limit.
title	string	Yes	Title. Generate/cover: up to 80 characters; extend and other operations: up to 100. Required for custom generation. maxLength: 100
negative_tags	string	Yes	Styles to exclude; required for adding instrumental backing or vocals. maxLength: 1000
tags	string	Yes	Musical style for this operation, up to 1000 characters. maxLength: 1000
lyrics	string	No / conditional	Lyrics, up to 5000 characters. See the operation for how this interacts with prompt. maxLength: 5000
model	string	No / conditional	Suno version: V6, V6_MINI or V6_WILD. Extension must match the generated source model. values: V6, V6_MINI, V6_WILD; default: V6

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.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "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."
    },
    "upload_url": {
      "type": "string",
      "format": "uri",
      "description": "Public HTTPS audio URL on port 443, without URL credentials. Use MP3/WAV/FLAC/OGG/M4A/AAC with a readable audio track. See the operation size limit."
    },
    "title": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100,
      "description": "Title. Generate/cover: up to 80 characters; extend and other operations: up to 100. Required for custom generation."
    },
    "negative_tags": {
      "type": "string",
      "maxLength": 1000,
      "description": "Styles to exclude; required for adding instrumental backing or vocals."
    },
    "tags": {
      "type": "string",
      "maxLength": 1000,
      "description": "Musical style for this operation, up to 1000 characters."
    },
    "lyrics": {
      "type": "string",
      "maxLength": 5000,
      "description": "Lyrics, up to 5000 characters. See the operation for how this interacts with prompt."
    },
    "model": {
      "default": "V6",
      "type": "string",
      "enum": [
        "V6",
        "V6_MINI",
        "V6_WILD"
      ],
      "description": "Suno version: V6, V6_MINI or V6_WILD. Extension must match the generated source model."
    }
  },
  "required": [
    "upload_url",
    "title",
    "negative_tags",
    "tags"
  ],
  "additionalProperties": false
}

Important conditions

Audio URL inputs must contain readable MP3/WAV/FLAC/OGG/M4A/AAC audio with positive duration; the limit is 500 MiB per file. URLs must be publicly accessible HTTPS on port 443, without embedded credentials or private-network addresses. Keep them accessible until the task finishes.
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.

{
  "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.

Voice: all four steps File uploads Callbacks

Authorizations

Authorization

string

header

required

Every valid key can submit and query its own account. Revoked keys are rejected.

Body

application/json

model

enum<string>

required

Available options:

suno_add_instrumental

Example:

"suno_add_instrumental"

input

object

required

Show child attributes

callback_url

string<uri>

Optional public HTTPS endpoint for signed completion callbacks; no redirects or private IPs.

Response

Accepted task. Poll the common task endpoint or use callback_url.

code

any

required

msg

any

required

data

object

required

Show child attributes

Getting started with APIstable

Market

Add instrumental backing

Using this operation

Create task

Acceptance response

Parameter reference

Inputs and limits

Important conditions

Result schema

Authorizations

Body

Response

​Using this operation

​Create task

​Acceptance response

​Parameter reference

​Inputs and limits

​Important conditions

​Result schema

​Related workflows

Authorizations

Body

Response

Using this operation

Create task

Acceptance response

Parameter reference

Inputs and limits

Important conditions

Result schema

Related workflows