---
title: kAudioUnitSubType_MultiChannelMixer
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudiounitsubtype_multichannelmixer
---

# kAudioUnitSubType_MultiChannelMixer

An audio unit that can have any number of input buses, with any number of channels on each input bus, and one output bus. In macOS, the output bus can have any number of channels. In iOS, the output bus always has two channels.

## Declaration

```swift
var kAudioUnitSubType_MultiChannelMixer: UInt32 { get }
```

## See Also

### Constants

- [kAudioUnitSubType_MatrixMixer](audiotoolbox/kaudiounitsubtype_matrixmixer.md)
- [kAudioUnitSubType_SpatialMixer](audiotoolbox/kaudiounitsubtype_spatialmixer.md)