> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apikley.ru/llms.txt
> Use this file to discover all available pages before exploring further.

# Suno api separate vocals callbacks

# 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

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

### 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

<CodeGroup>
  ```json Success Callback - separate_vocal theme={null} theme={null}
  {
    "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"
      }
    }
  }
  ```

  ```json Failure Callback - separate_vocal theme={null} theme={null}
  {
    "code": 500,
    "msg": "Vocal separation failed",
    "data": {
      "task_id": "3e63b4cc88d52611159371f6af5571e7",
      "vocal_separation_info": null
    }
  }
  ```
</CodeGroup>

### split\_stem Type Callbacks

<CodeGroup>
  ```json Success Callback - split_stem theme={null} theme={null}
  {
    "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"
      }
    }
  }
  ```

  ```json Failure Callback - split_stem theme={null} theme={null}
  {
    "code": 500,
    "msg": "Instrument separation failed",
    "data": {
      "task_id": "e649edb7abfd759285bd41a47a634b10",
      "vocal_separation_info": null
    }
  }
  ```
</CodeGroup>

## Status Code Description

<ParamField path="code" type="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           |
</ParamField>

<ParamField path="msg" type="string" required>
  Status message providing detailed status description
</ParamField>

<ParamField path="data.task_id" type="string" required>
  Task ID, consistent with the task\_id returned when you submitted the task
</ParamField>

<ParamField path="data.vocal_separation_info" type="object">
  Vocal separation result information, returned on success. The returned fields depend on the separation type (type parameter)
</ParamField>

## separate\_vocal Type Callback Fields

<ParamField path="data.vocal_separation_info.instrumental_url" type="string">
  Instrumental part audio URL (separate\_vocal type only)
</ParamField>

<ParamField path="data.vocal_separation_info.origin_url" type="string">
  Original audio URL
</ParamField>

<ParamField path="data.vocal_separation_info.vocal_url" type="string">
  Vocal part audio URL
</ParamField>

## split\_stem Type Callback Fields

<ParamField path="data.vocal_separation_info.origin_url" type="string">
  Original audio URL
</ParamField>

<ParamField path="data.vocal_separation_info.vocal_url" type="string">
  Main vocal audio URL
</ParamField>

<ParamField path="data.vocal_separation_info.backing_vocals_url" type="string">
  Backing vocals audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.drums_url" type="string">
  Drums part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.bass_url" type="string">
  Bass part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.guitar_url" type="string">
  Guitar part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.keyboard_url" type="string">
  Keyboard part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.percussion_url" type="string">
  Percussion part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.strings_url" type="string">
  Strings part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.synth_url" type="string">
  Synthesizer part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.fx_url" type="string">
  Effects part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.brass_url" type="string">
  Brass part audio URL (split\_stem type only)
</ParamField>

<ParamField path="data.vocal_separation_info.woodwinds_url" type="string">
  Woodwinds part audio URL (split\_stem type only)
</ParamField>

## Callback Reception Examples

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

<Tabs>
  <Tab title="Node.js">
    ```javascript theme={null} theme={null}
    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}`);
          
          // separate_vocal type specific fields
          if (vocalInfo.instrumental_url) {
            console.log(`Instrumental part: ${vocalInfo.instrumental_url}`);
          }
          
          // split_stem type specific fields
          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}`);
          }
          
          // Process separated audio files
          // Can download files, save locally, etc.
        }
        
      } else {
        // Task failed
        console.log('Vocal separation failed:', msg);
        
        // Handle failure scenarios...
      }
      
      // Return 200 status code to confirm callback received
      res.status(200).json({ status: 'received' });
    });

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

  <Tab title="Python">
    ```python theme={null} theme={null}
    from flask import Flask, request, jsonify
    import requests
    import os

    app = Flask(__name__)

    @app.route('/suno-vocal-separation-callback', methods=['POST'])
    def handle_callback():
        data = request.json
        
        code = data.get('code')
        msg = data.get('msg')
        callback_data = data.get('data', {})
        task_id = callback_data.get('task_id')
        vocal_info = callback_data.get('vocal_separation_info')
        
        print(f"Received vocal separation callback: {task_id}, status: {code}, message: {msg}")
        
        if code == 200:
            # Task completed successfully
            print("Vocal separation completed")
            
            if vocal_info:
                print("Separation results:")
                print(f"Original audio: {vocal_info.get('origin_url')}")
                print(f"Vocal part: {vocal_info.get('vocal_url')}")
                
                # separate_vocal type specific fields
                if vocal_info.get('instrumental_url'):
                    print(f"Instrumental part: {vocal_info.get('instrumental_url')}")
                
                # split_stem type specific fields
                if vocal_info.get('backing_vocals_url'):
                    print(f"Backing vocals: {vocal_info.get('backing_vocals_url')}")
                    print(f"Drums part: {vocal_info.get('drums_url')}")
                    print(f"Bass part: {vocal_info.get('bass_url')}")
                    print(f"Guitar part: {vocal_info.get('guitar_url')}")
                    print(f"Keyboard part: {vocal_info.get('keyboard_url')}")
                    print(f"Percussion part: {vocal_info.get('percussion_url')}")
                    print(f"Strings part: {vocal_info.get('strings_url')}")
                    print(f"Synthesizer part: {vocal_info.get('synth_url')}")
                    print(f"Effects part: {vocal_info.get('fx_url')}")
                    print(f"Brass part: {vocal_info.get('brass_url')}")
                    print(f"Woodwinds part: {vocal_info.get('woodwinds_url')}")
                
                # Process separated audio files
                # Download file example
                def download_audio_file(url, filename):
                    if url:
                        try:
                            response = requests.get(url)
                            if response.status_code == 200:
                                with open(filename, "wb") as f:
                                    f.write(response.content)
                                print(f"Saved: {filename}")
                        except Exception as e:
                            print(f"Download failed {filename}: {e}")
                
                # Create directory
                os.makedirs(f"vocal_separation_{task_id}", exist_ok=True)
                
                # Download separated audio files
                download_audio_file(vocal_info.get('vocal_url'), 
                                  f"vocal_separation_{task_id}/vocal.mp3")
                
                # separate_vocal type files
                if vocal_info.get('instrumental_url'):
                    download_audio_file(vocal_info.get('instrumental_url'), 
                                      f"vocal_separation_{task_id}/instrumental.mp3")
                
                # split_stem type files
                if vocal_info.get('backing_vocals_url'):
                    stem_files = {
                        'backing_vocals': vocal_info.get('backing_vocals_url'),
                        'drums': vocal_info.get('drums_url'),
                        'bass': vocal_info.get('bass_url'),
                        'guitar': vocal_info.get('guitar_url'),
                        'keyboard': vocal_info.get('keyboard_url'),
                        'percussion': vocal_info.get('percussion_url'),
                        'strings': vocal_info.get('strings_url'),
                        'synth': vocal_info.get('synth_url'),
                        'fx': vocal_info.get('fx_url'),
                        'brass': vocal_info.get('brass_url'),
                        'woodwinds': vocal_info.get('woodwinds_url')
                    }
                    
                    for name, url in stem_files.items():
                        download_audio_file(url, f"vocal_separation_{task_id}/{name}.mp3")
                    
        else:
            # Task failed
            print(f"Vocal separation failed: {msg}")
            
            # Handle failure scenarios...
        
        # Return 200 status code to confirm callback received
        return jsonify({'status': 'received'}), 200

    if __name__ == '__main__':
        app.run(host='0.0.0.0', port=3000)
    ```
  </Tab>

  <Tab title="PHP">
    ```php theme={null} theme={null}
    <?php
    header('Content-Type: application/json');

    // Get POST data
    $input = file_get_contents('php://input');
    $data = json_decode($input, true);

    $code = $data['code'] ?? null;
    $msg = $data['msg'] ?? '';
    $callbackData = $data['data'] ?? [];
    $taskId = $callbackData['task_id'] ?? '';
    $vocalInfo = $callbackData['vocal_separation_info'] ?? null;

    error_log("Received vocal separation callback: $taskId, status: $code, message: $msg");

    if ($code === 200) {
        // Task completed successfully
        error_log("Vocal separation completed");
        
        if ($vocalInfo) {
            error_log("Separation results:");
            error_log("Original audio: " . ($vocalInfo['origin_url'] ?? ''));
            error_log("Vocal part: " . ($vocalInfo['vocal_url'] ?? ''));
            
            // separate_vocal type specific fields
            if (!empty($vocalInfo['instrumental_url'])) {
                error_log("Instrumental part: " . $vocalInfo['instrumental_url']);
            }
            
            // split_stem type specific fields
            if (!empty($vocalInfo['backing_vocals_url'])) {
                error_log("Backing vocals: " . $vocalInfo['backing_vocals_url']);
                error_log("Drums part: " . ($vocalInfo['drums_url'] ?? ''));
                error_log("Bass part: " . ($vocalInfo['bass_url'] ?? ''));
                error_log("Guitar part: " . ($vocalInfo['guitar_url'] ?? ''));
                error_log("Keyboard part: " . ($vocalInfo['keyboard_url'] ?? ''));
                error_log("Percussion part: " . ($vocalInfo['percussion_url'] ?? ''));
                error_log("Strings part: " . ($vocalInfo['strings_url'] ?? ''));
                error_log("Synthesizer part: " . ($vocalInfo['synth_url'] ?? ''));
                error_log("Effects part: " . ($vocalInfo['fx_url'] ?? ''));
                error_log("Brass part: " . ($vocalInfo['brass_url'] ?? ''));
                error_log("Woodwinds part: " . ($vocalInfo['woodwinds_url'] ?? ''));
            }
            
            // Process separated audio files
            function downloadAudioFile($url, $filename) {
                if (!empty($url)) {
                    try {
                        $audioContent = file_get_contents($url);
                        if ($audioContent !== false) {
                            file_put_contents($filename, $audioContent);
                            error_log("Saved: $filename");
                        }
                    } catch (Exception $e) {
                        error_log("Download failed $filename: " . $e->getMessage());
                    }
                }
            }
            
            // Create directory
            $dir = "vocal_separation_$taskId";
            if (!is_dir($dir)) {
                mkdir($dir, 0777, true);
            }
            
            // Download basic files
            downloadAudioFile($vocalInfo['vocal_url'] ?? '', "$dir/vocal.mp3");
            
            // separate_vocal type files
            if (!empty($vocalInfo['instrumental_url'])) {
                downloadAudioFile($vocalInfo['instrumental_url'], "$dir/instrumental.mp3");
            }
            
            // split_stem type files
            if (!empty($vocalInfo['backing_vocals_url'])) {
                $stemFiles = [
                    'backing_vocals' => $vocalInfo['backing_vocals_url'] ?? '',
                    'drums' => $vocalInfo['drums_url'] ?? '',
                    'bass' => $vocalInfo['bass_url'] ?? '',
                    'guitar' => $vocalInfo['guitar_url'] ?? '',
                    'keyboard' => $vocalInfo['keyboard_url'] ?? '',
                    'percussion' => $vocalInfo['percussion_url'] ?? '',
                    'strings' => $vocalInfo['strings_url'] ?? '',
                    'synth' => $vocalInfo['synth_url'] ?? '',
                    'fx' => $vocalInfo['fx_url'] ?? '',
                    'brass' => $vocalInfo['brass_url'] ?? '',
                    'woodwinds' => $vocalInfo['woodwinds_url'] ?? ''
                ];
                
                foreach ($stemFiles as $name => $url) {
                    downloadAudioFile($url, "$dir/$name.mp3");
                }
            }
        }
        
    } else {
        // Task failed
        error_log("Vocal separation failed: $msg");
        
        // Handle failure scenarios...
    }

    // Return 200 status code to confirm callback received
    http_response_code(200);
    echo json_encode(['status' => 'received']);
    ?>
    ```
  </Tab>
</Tabs>

## Best Practices

<Tip>
  ### Callback URL Configuration Recommendations

  1. **Use HTTPS**: Ensure callback URL uses HTTPS protocol for secure data transmission
  2. **Verify Origin**: Verify the legitimacy of the request source in callback processing
  3. **Idempotent Processing**: The same task\_id may receive multiple callbacks, ensure processing logic is idempotent
  4. **Quick Response**: Callback processing should return 200 status code quickly to avoid timeout
  5. **Asynchronous Processing**: Complex business logic should be processed asynchronously to avoid blocking callback responses
  6. **Type-based Processing**: Handle different audio file structures based on different separation types
  7. **Batch Download**: split\_stem type produces multiple files, recommend batch downloading and organizing by type
</Tip>

<Warning>
  ### 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
</Warning>

## Troubleshooting

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

<AccordionGroup>
  <Accordion title="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
  </Accordion>

  <Accordion title="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
  </Accordion>

  <Accordion title="Content Format Issues">
    * Confirm received POST request body is in JSON format
    * Check if Content-Type is application/json
    * Verify JSON parsing is correct
  </Accordion>

  <Accordion title="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
  </Accordion>
</AccordionGroup>

## Alternative Solutions

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

<Card title="Poll Query Results" icon="radar" href="/suno-api/get-vocal-separation-details">
  Use the Get Vocal Separation Details endpoint to periodically query task status. We recommend querying every 30 seconds.
</Card>

***

> To find navigation and other pages in this documentation, fetch the llms.txt file at: [https://docs.apikley.ru/llms.txt](https://docs.apikley.ru/llms.txt)

> Rate limits and quotas are enforced by Apikley and may differ from upstream providers.