Audio Separation Callbacks

System will call this callback when vocal and instrument separation is complete.When you submit a vocal separation task to the Suno API, you can use the callBackUrl parameter to set a callback URL. The system will automatically push the results to your specified address when the task is completed.

Callback Mechanism Overview #

The callback mechanism eliminates the need to poll the API for task status. The system will proactively push task completion results to your server.

Webhook Security

To ensure the authenticity and integrity of callback requests, we strongly recommend implementing webhook signature verification. See our Webhook Verification Guide for detailed implementation steps.

Callback Timing #

The system will send callback notifications in the following situations:

Vocal separation task completed successfully

Vocal separation task failed

Errors occurred during task processing

Callback Method #

HTTP Method: POST

Content Type: application/json

Timeout Setting: 15 seconds

Callback Request Format #

When the task is completed, the system will send a POST request to your callBackUrl based on the separation type you selected. Different separation types correspond to different callback data structures:

separate_vocal Type Callbacks #

Success Callback

Failure Callback

{
  "code": 200,
  "msg": "vocal separation generated successfully.",
  "data": {
    "task_id": "3e63b4cc88d52611159371f6af5571e7",
    "vocal_separation_info": {
      "instrumental_url": "https://file.aiquickdraw.com/s/d92a13bf-c6f4-4ade-bb47-f69738435528_Instrumental.mp3",
      "origin_url": "",
      "vocal_url": "https://file.aiquickdraw.com/s/3d7021c9-fa8b-4eda-91d1-3b9297ddb172_Vocals.mp3"
    }
  }
}

split_stem Type Callbacks #

Success Callback

Failure Callback

{
  "code": 200,
  "msg": "vocal separation generated successfully.",
  "data": {
    "task_id": "e649edb7abfd759285bd41a47a634b10",
    "vocal_separation_info": {
      "origin_url": "",
      "backing_vocals_url": "https://file.aiquickdraw.com/s/aadc51a3-4c88-4c8e-a4c8-e867c539673d_Backing_Vocals.mp3",
      "bass_url": "https://file.aiquickdraw.com/s/a3c2da5a-b364-4422-adb5-2692b9c26d33_Bass.mp3",
      "brass_url": "https://file.aiquickdraw.com/s/334b2d23-0c65-4a04-92c7-22f828afdd44_Brass.mp3",
      "drums_url": "https://file.aiquickdraw.com/s/ac75c5ea-ac77-4ad2-b7d9-66e140b78e44_Drums.mp3",
      "fx_url": "https://file.aiquickdraw.com/s/a8822c73-6629-4089-8f2a-d19f41f0007d_FX.mp3",
      "guitar_url": "https://file.aiquickdraw.com/s/064dd08e-d5d2-4201-9058-c5c40fb695b4_Guitar.mp3",
      "keyboard_url": "https://file.aiquickdraw.com/s/adc934e0-df7d-45da-8220-1dba160d74e0_Keyboard.mp3",
      "percussion_url": "https://file.aiquickdraw.com/s/0f70884d-047c-41f1-a6d0-7044618b7dc6_Percussion.mp3",
      "strings_url": "https://file.aiquickdraw.com/s/49829425-a5b0-424e-857a-75d4c63a426b_Strings.mp3",
      "synth_url": "https://file.aiquickdraw.com/s/56b2d94a-eb92-4d21-bc43-3460de0c8348_Synth.mp3",
      "vocal_url": "https://file.aiquickdraw.com/s/07420749-29a2-4054-9b62-e6a6f8b90ccb_Vocals.mp3",
      "woodwinds_url": "https://file.aiquickdraw.com/s/d81545b1-6f94-4388-9785-1aaa6ecabb02_Woodwinds.mp3"
    }
  }
}

Status Code Description #

code (integer, required) #

Callback status code indicating task processing result:

Status Code	Description
200	Success - Request has been processed successfully
500	Internal Error - Please try again later

msg (string, required) #

Status message providing detailed status description

data.task_id (string, required) #

Task ID, consistent with the task_id returned when you submitted the task

data.vocal_separation_info (object) #

Vocal separation result information, returned on success. The returned fields depend on the separation type (type parameter)

separate_vocal Type Callback Fields #

data.vocal_separation_info.instrumental_url (string) #

Instrumental part audio URL (separate_vocal type only)

data.vocal_separation_info.origin_url (string) #

Original audio URL

data.vocal_separation_info.vocal_url (string) #

Vocal part audio URL

split_stem Type Callback Fields #

data.vocal_separation_info.origin_url (string) #

Original audio URL

data.vocal_separation_info.vocal_url (string) #

Main vocal audio URL

data.vocal_separation_info.backing_vocals_url (string) #

Backing vocals audio URL (split_stem type only)

data.vocal_separation_info.drums_url (string) #

Drums part audio URL (split_stem type only)

data.vocal_separation_info.bass_url (string) #

Bass part audio URL (split_stem type only)

data.vocal_separation_info.guitar_url (string) #

Guitar part audio URL (split_stem type only)

data.vocal_separation_info.keyboard_url (string) #

Keyboard part audio URL (split_stem type only)

data.vocal_separation_info.percussion_url (string) #

Percussion part audio URL (split_stem type only)

data.vocal_separation_info.strings_url (string) #

Strings part audio URL (split_stem type only)

data.vocal_separation_info.synth_url (string) #

Synthesizer part audio URL (split_stem type only)

data.vocal_separation_info.fx_url (string) #

Effects part audio URL (split_stem type only)

data.vocal_separation_info.brass_url (string) #

Brass part audio URL (split_stem type only)

data.vocal_separation_info.woodwinds_url (string) #

Woodwinds part audio URL (split_stem type only)

Callback Reception Examples #

Below are example codes for receiving callbacks in popular programming languages:

Node.js

Python

PHP

const express = require('express');
const app = express();

app.use(express.json());

app.post('/suno-vocal-separation-callback', (req, res) => {
  const { code, msg, data } = req.body;

  console.log('Received vocal separation callback:', {
    taskId: data.task_id,
    status: code,
    message: msg
  });

  if (code === 200) {
    // Task completed successfully
    console.log('Vocal separation completed');
    const vocalInfo = data.vocal_separation_info;

    if (vocalInfo) {
      console.log('Separation results:');
      console.log(`Original audio: ${vocalInfo.origin_url}`);
      console.log(`Vocal part: ${vocalInfo.vocal_url}`);

      if (vocalInfo.instrumental_url) {
        console.log(`Instrumental part: ${vocalInfo.instrumental_url}`);
      }

      if (vocalInfo.backing_vocals_url) {
        console.log(`Backing vocals: ${vocalInfo.backing_vocals_url}`);
        console.log(`Drums part: ${vocalInfo.drums_url}`);
        console.log(`Bass part: ${vocalInfo.bass_url}`);
        console.log(`Guitar part: ${vocalInfo.guitar_url}`);
        console.log(`Keyboard part: ${vocalInfo.keyboard_url}`);
        console.log(`Percussion part: ${vocalInfo.percussion_url}`);
        console.log(`Strings part: ${vocalInfo.strings_url}`);
        console.log(`Synthesizer part: ${vocalInfo.synth_url}`);
        console.log(`Effects part: ${vocalInfo.fx_url}`);
        console.log(`Brass part: ${vocalInfo.brass_url}`);
        console.log(`Woodwinds part: ${vocalInfo.woodwinds_url}`);
      }
    }

  } else {
    console.log('Vocal separation failed:', msg);
  }

  res.status(200).json({ status: 'received' });
});

app.listen(3000, () => {
  console.log('Callback server running on port 3000');
});

Best Practices #

Callback URL Configuration Recommendations

Use HTTPS: Ensure callback URL uses HTTPS protocol for secure data transmission

Verify Origin: Verify the legitimacy of the request source in callback processing

Idempotent Processing: The same task_id may receive multiple callbacks, ensure processing logic is idempotent

Quick Response: Callback processing should return 200 status code quickly to avoid timeout

Asynchronous Processing: Complex business logic should be processed asynchronously to avoid blocking callback responses

Type-based Processing: Handle different audio file structures based on different separation types

Batch Download: split_stem type produces multiple files, recommend batch downloading and organizing by type

Important Reminders

Callback URL must be publicly accessible

Server must respond within 15 seconds, otherwise will be considered timeout

If 3 consecutive retry attempts fail, the system will stop sending callbacks

Please ensure the stability of callback processing logic to avoid callback failures due to exceptions

Vocal separation generated audio file URLs may have time limits, recommend downloading and saving promptly

Note that some audio part URLs may be empty, certain instrument separations might be empty

separate_vocal and split_stem types return different fields, please handle corresponding fields based on the type parameter in the request

Troubleshooting #

If you are not receiving callback notifications, please check the following:Network Connection Issues

Confirm callback URL is accessible from public internet

Check firewall settings to ensure inbound requests are not blocked

Verify domain name resolution is correct

Server Response Issues

Ensure server returns HTTP 200 status code within 15 seconds

Check server logs for error messages

Verify endpoint path and HTTP method are correct

Content Format Issues

Confirm received POST request body is in JSON format

Check if Content-Type is application/json

Verify JSON parsing is correct

File Processing Issues

Confirm all audio file URLs are accessible

Check file download permissions and network connection

Verify file save path and permissions

Note that some instrument separation results may be empty

Note the field differences between separate_vocal and split_stem types

Alternative Solutions #

If you cannot use the callback mechanism, you can also use polling:

Poll Query Results

Use the Get Vocal Separation Details endpoint to periodically query task status. We recommend querying every 30 seconds.

Audio Separation Callbacks ​

Callback Mechanism Overview # ​

Callback Timing # ​

Callback Method # ​

Callback Request Format # ​

separate_vocal Type Callbacks # ​

split_stem Type Callbacks # ​

Status Code Description # ​

code (integer, required) # ​

msg (string, required) # ​

data.task_id (string, required) # ​

data.vocal_separation_info (object) # ​

separate_vocal Type Callback Fields # ​

data.vocal_separation_info.instrumental_url (string) # ​

data.vocal_separation_info.origin_url (string) # ​

data.vocal_separation_info.vocal_url (string) # ​

split_stem Type Callback Fields # ​

data.vocal_separation_info.origin_url (string) # ​

data.vocal_separation_info.vocal_url (string) # ​

data.vocal_separation_info.backing_vocals_url (string) # ​

data.vocal_separation_info.drums_url (string) # ​

data.vocal_separation_info.bass_url (string) # ​

data.vocal_separation_info.guitar_url (string) # ​

data.vocal_separation_info.keyboard_url (string) # ​

data.vocal_separation_info.percussion_url (string) # ​

data.vocal_separation_info.strings_url (string) # ​

data.vocal_separation_info.synth_url (string) # ​

data.vocal_separation_info.fx_url (string) # ​

data.vocal_separation_info.brass_url (string) # ​

data.vocal_separation_info.woodwinds_url (string) # ​

Callback Reception Examples # ​

Best Practices # ​

Troubleshooting # ​

Alternative Solutions # ​

Audio Separation Callbacks

Callback Mechanism Overview #

Callback Timing #

Callback Method #

Callback Request Format #

separate_vocal Type Callbacks #

split_stem Type Callbacks #

Status Code Description #

code (integer, required) #

msg (string, required) #

data.task_id (string, required) #

data.vocal_separation_info (object) #

separate_vocal Type Callback Fields #

data.vocal_separation_info.instrumental_url (string) #

data.vocal_separation_info.origin_url (string) #

data.vocal_separation_info.vocal_url (string) #

split_stem Type Callback Fields #

data.vocal_separation_info.origin_url (string) #

data.vocal_separation_info.vocal_url (string) #

data.vocal_separation_info.backing_vocals_url (string) #

data.vocal_separation_info.drums_url (string) #

data.vocal_separation_info.bass_url (string) #

data.vocal_separation_info.guitar_url (string) #

data.vocal_separation_info.keyboard_url (string) #

data.vocal_separation_info.percussion_url (string) #

data.vocal_separation_info.strings_url (string) #

data.vocal_separation_info.synth_url (string) #

data.vocal_separation_info.fx_url (string) #

data.vocal_separation_info.brass_url (string) #

data.vocal_separation_info.woodwinds_url (string) #

Callback Reception Examples #

Best Practices #

Troubleshooting #

Alternative Solutions #