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# Mixer Audio Unit Properties

Properties for Apple mixer audio units.

## Topics

### Constants

[`var kAudioUnitProperty_InputAnchorTimeStamp: AudioUnitPropertyID`](/documentation/AudioToolbox/kAudioUnitProperty_InputAnchorTimeStamp)

[`var kAudioUnitProperty_MatrixDimensions: AudioUnitPropertyID`](/documentation/AudioToolbox/kAudioUnitProperty_MatrixDimensions)

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

[`var kAudioUnitProperty_MatrixLevels: AudioUnitPropertyID`](/documentation/AudioToolbox/kAudioUnitProperty_MatrixLevels)

Describes the internal state of a matrix mixer.

[`var kAudioUnitProperty_MeterClipping: AudioUnitPropertyID`](/documentation/AudioToolbox/kAudioUnitProperty_MeterClipping)

Indicates audio clipping that has occurred since this property was last accessed.

[`var kAudioUnitProperty_MeteringMode: AudioUnitPropertyID`](/documentation/AudioToolbox/kAudioUnitProperty_MeteringMode)

Specifies whether metering is enabled or disabled for a particular scope-element combination.


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