---
title: MIDI Audio Unit Parameters
framework: audiotoolbox
role: collectionGroup
role_heading: API Collection
path: audiotoolbox/1389613-midi_audio_unit_parameters
---

# MIDI Audio Unit Parameters

Parameters for instrument units.

## Topics

### Constants

- [kAUGroupParameterID_AllNotesOff](audiotoolbox/kaugroupparameterid_allnotesoff.md)
- [kAUGroupParameterID_AllSoundOff](audiotoolbox/kaugroupparameterid_allsoundoff.md)
- [kAUGroupParameterID_ChannelPressure](audiotoolbox/kaugroupparameterid_channelpressure.md)
- [kAUGroupParameterID_DataEntry](audiotoolbox/kaugroupparameterid_dataentry.md)
- [kAUGroupParameterID_DataEntry_LSB](audiotoolbox/kaugroupparameterid_dataentry_lsb.md)
- [kAUGroupParameterID_Expression](audiotoolbox/kaugroupparameterid_expression.md)
- [kAUGroupParameterID_Expression_LSB](audiotoolbox/kaugroupparameterid_expression_lsb.md)
- [kAUGroupParameterID_Foot](audiotoolbox/kaugroupparameterid_foot.md)
- [kAUGroupParameterID_Foot_LSB](audiotoolbox/kaugroupparameterid_foot_lsb.md)
- [kAUGroupParameterID_KeyPressure](audiotoolbox/kaugroupparameterid_keypressure.md)
- [kAUGroupParameterID_KeyPressure_FirstKey](audiotoolbox/kaugroupparameterid_keypressure_firstkey.md)
- [kAUGroupParameterID_KeyPressure_LastKey](audiotoolbox/kaugroupparameterid_keypressure_lastkey.md)
- [kAUGroupParameterID_ModWheel](audiotoolbox/kaugroupparameterid_modwheel.md)
- [kAUGroupParameterID_ModWheel_LSB](audiotoolbox/kaugroupparameterid_modwheel_lsb.md)
- [kAUGroupParameterID_Pan](audiotoolbox/kaugroupparameterid_pan.md)
- [kAUGroupParameterID_Pan_LSB](audiotoolbox/kaugroupparameterid_pan_lsb.md)
- [kAUGroupParameterID_PitchBend](audiotoolbox/kaugroupparameterid_pitchbend.md)
- [kAUGroupParameterID_ResetAllControllers](audiotoolbox/kaugroupparameterid_resetallcontrollers.md)
- [kAUGroupParameterID_Sostenuto](audiotoolbox/kaugroupparameterid_sostenuto.md)
- [kAUGroupParameterID_Sustain](audiotoolbox/kaugroupparameterid_sustain.md)
- [kAUGroupParameterID_Volume](audiotoolbox/kaugroupparameterid_volume.md)
- [kAUGroupParameterID_Volume_LSB](audiotoolbox/kaugroupparameterid_volume_lsb.md)

## See Also

### Enumerations

- [Audio Unit Types](audiotoolbox/1584142-audio_unit_types.md)
- [Inter-App Audio Unit Types](audiotoolbox/1619501-inter-app-audio-unit-types.md)
- [Audio Unit Manufacturer Identifier](audiotoolbox/1584143-audio_unit_manufacturer_identifi.md)
- [Audio Unit Output Subtypes](audiotoolbox/1584148-audio-unit-output-subtypes.md)
- [I/O Audio Unit Subtypes](audiotoolbox/1619485-i-o-audio-unit-subtypes.md)
- [Converter Audio Unit Subtypes](audiotoolbox/1584145-converter_audio_unit_subtypes.md)
- [Reserved Audio Unit Clump Identifier](audiotoolbox/1533986-reserved_audio_unit_clump_identi.md)
- [Offline Audio Unit Properties](audiotoolbox/1534054-offline_audio_unit_properties.md)
- [General Audio Unit Function Selectors](audiotoolbox/1584140-general_audio_unit_function_sele.md)
- [Generator Audio Unit Subtypes](audiotoolbox/1619493-generator_audio_unit_subtypes.md)
- [Input/Output Audio Unit Subtypes](audiotoolbox/1584139-input_output_audio_unit_subtypes.md)
- [Audio Unit Panner Subtypes](audiotoolbox/1584151-audio-unit-panner-subtypes.md)
- [Audio Unit Player Subtypes](audiotoolbox/1584155-audio-unit-player-subtypes.md)
- [Audio Unit Pitch Subtypes](audiotoolbox/1584152-audio-unit-pitch-subtypes.md)
- [AudioUnitEventType](audiotoolbox/audiouniteventtype.md)