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# AVAudioMixInputParametersTrackID

Special value for the trackID property of AVAudioMixInputParameters.

```
enum AVAudioMixInputParametersTrackID
```

## Topics

### Creating a track identifier

[`init(rawValue:)`](/documentation/AVFoundation/AVAudioMixInputParametersTrackID/init(rawValue:))

### Track identifiers

[`AVAudioMixInputParametersTrackMixID`](/documentation/AVFoundation/AVAudioMixInputParametersTrackID/mixID)

Indicates that the specified input parameters should be applied to the mix of all audio tracks rather than to a single specific audio track. This is particularly useful for setting up volume ramps or an audio tap for streaming playback.

## Relationships

### Conforms To

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Hashable`](/documentation/Swift/Hashable)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`Equatable`](/documentation/Swift/Equatable)

[`BitwiseCopyable`](/documentation/Swift/BitwiseCopyable)

[`Sendable`](/documentation/Swift/Sendable)

---

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