---
title: kAudioUnitProperty_MatrixDimensions
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudiounitproperty_matrixdimensions
---

# kAudioUnitProperty_MatrixDimensions

Indicates the total number of channels for input and output of a given matrix mixer.

## Declaration

```swift
var kAudioUnitProperty_MatrixDimensions: AudioUnitPropertyID { get }
```

## Discussion

Discussion A read-only 2 * UInt32 value valid on the audio unit global scope.

## See Also

### Constants

- [kAudioUnitProperty_InputAnchorTimeStamp](audiotoolbox/kaudiounitproperty_inputanchortimestamp.md)
- [kAudioUnitProperty_MatrixLevels](audiotoolbox/kaudiounitproperty_matrixlevels.md)
- [kAudioUnitProperty_MeterClipping](audiotoolbox/kaudiounitproperty_meterclipping.md)
- [kAudioUnitProperty_MeteringMode](audiotoolbox/kaudiounitproperty_meteringmode.md)