---
title: audioMix
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avassetreaderaudiomixoutput/audiomix
---

# audioMix

The audio mix to use with this output.

## Declaration

```swift
@NSCopying var audioMix: AVAudioMix? { get set }
```

## Discussion

Discussion Use an audio mix to specify how an audio track’s volume changes over the media’s timeline.

## See Also

### Configuring audio settings

- [audioTimePitchAlgorithm](avfoundation/avassetreaderaudiomixoutput/audiotimepitchalgorithm.md)