<!--
{
  "documentType" : "article",
  "framework" : "AudioToolbox",
  "identifier" : "/documentation/AudioToolbox/1389613-midi_audio_unit_parameters",
  "metadataVersion" : "0.1.0",
  "role" : "collectionGroup",
  "title" : "MIDI Audio Unit Parameters"
}
-->

# MIDI Audio Unit Parameters

Parameters for instrument units.

## Topics

### Constants

[`var kAUGroupParameterID_AllNotesOff: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_AllNotesOff)

[`var kAUGroupParameterID_AllSoundOff: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_AllSoundOff)

[`var kAUGroupParameterID_ChannelPressure: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_ChannelPressure)

[`var kAUGroupParameterID_DataEntry: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_DataEntry)

[`var kAUGroupParameterID_DataEntry_LSB: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_DataEntry_LSB)

[`var kAUGroupParameterID_Expression: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Expression)

[`var kAUGroupParameterID_Expression_LSB: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Expression_LSB)

[`var kAUGroupParameterID_Foot: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Foot)

[`var kAUGroupParameterID_Foot_LSB: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Foot_LSB)

[`var kAUGroupParameterID_KeyPressure: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_KeyPressure)

[`var kAUGroupParameterID_KeyPressure_FirstKey: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_KeyPressure_FirstKey)

[`var kAUGroupParameterID_KeyPressure_LastKey: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_KeyPressure_LastKey)

[`var kAUGroupParameterID_ModWheel: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_ModWheel)

[`var kAUGroupParameterID_ModWheel_LSB: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_ModWheel_LSB)

[`var kAUGroupParameterID_Pan: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Pan)

[`var kAUGroupParameterID_Pan_LSB: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Pan_LSB)

[`var kAUGroupParameterID_PitchBend: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_PitchBend)

[`var kAUGroupParameterID_ResetAllControllers: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_ResetAllControllers)

[`var kAUGroupParameterID_Sostenuto: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Sostenuto)

[`var kAUGroupParameterID_Sustain: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Sustain)

[`var kAUGroupParameterID_Volume: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Volume)

[`var kAUGroupParameterID_Volume_LSB: AudioUnitParameterID`](/documentation/AudioToolbox/kAUGroupParameterID_Volume_LSB)


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)