---
title: Audio Unit Properties
framework: audiotoolbox
role: collectionGroup
role_heading: API Collection
path: audiotoolbox/audio-unit-properties
---

# Audio Unit Properties

Obtain information about the built-in mixers, equalizers, filters, effects, and other Audio Unit app extensions.

## Topics

### General

- [Other Plug-In Formats](audiotoolbox/1534082-other-plug-in-formats.md)
- [RenderQuality](audiotoolbox/1534177-renderquality.md)
- [General Audio Unit Properties](audiotoolbox/general-audio-unit-properties.md)
- [HostCallbackInfo](audiotoolbox/hostcallbackinfo.md)

### Mixers

- [Audio Unit Mixer Subtypes](audiotoolbox/1584146-audio-unit-mixer-subtypes.md)
- [AUSpatialMixerAttenuationCurve](audiotoolbox/auspatialmixerattenuationcurve.md)
- [AUSpatialMixerRenderingFlags](audiotoolbox/auspatialmixerrenderingflags.md)
- [AUSpatialMixer Parameters](audiotoolbox/1390073-auspatialmixer-parameters.md)
- [Panner Audio Unit Parameters](audiotoolbox/1389991-panner-audio-unit-parameters.md)
- [AUMatrixMixer Parameters](audiotoolbox/1390003-aumatrixmixer-parameters.md)
- [AUMultiChannelMixer Parameters](audiotoolbox/1389739-aumultichannelmixer_parameters.md)
- [Spatial Mixer Property IDs](audiotoolbox/1534150-spatial-mixer-property-ids.md)
- [Stereo Mixer Unit Parameters](audiotoolbox/1389928-stereo-mixer-unit-parameters.md)
- [Mixer Audio Unit Properties](audiotoolbox/1534041-mixer_audio_unit_properties.md)
- [Mixer Audio Unit Subtypes](audiotoolbox/1584150-mixer_audio_unit_subtypes.md)
- [AUSpatialMixerOutputType](audiotoolbox/auspatialmixeroutputtype.md)
- [AUSpatialMixerPointSourceInHeadMode](audiotoolbox/auspatialmixerpointsourceinheadmode.md)
- [AUSpatialMixerSourceMode](audiotoolbox/auspatialmixersourcemode.md)
- [3D Mixer Unit Parameters](audiotoolbox/1389763-3d_mixer_unit_parameters.md)
- [AU3DMixerAttenuationCurve](audiotoolbox/au3dmixerattenuationcurve.md)
- [AU3DMixerRenderingFlags](audiotoolbox/au3dmixerrenderingflags.md)
- [MixerDistanceParams](audiotoolbox/mixerdistanceparams.md)

### Equalizers

- [Parametric EQ Unit Parameters](audiotoolbox/1389950-parametric_eq_unit_parameters.md)
- [Audio Unit Graphic EQ Parameter ID](audiotoolbox/1389932-audio-unit-graphic-eq-parameter.md)
- [Peak Limiter Unit Parameters](audiotoolbox/1389597-peak_limiter_unit_parameters.md)
- [Dynamics Processor Unit Parameters](audiotoolbox/1389787-dynamics_processor_unit_paramete.md)
- [Frequency Response Constants](audiotoolbox/1534092-frequency_response_constants.md)
- [AUSpatializationAlgorithm](audiotoolbox/auspatializationalgorithm.md)

### Filters

- [Audio Unit Filter Subtypes](audiotoolbox/1584153-audio-unit-filter-subtypes.md)
- [Bandpass Unit Parameters](audiotoolbox/1390144-bandpass_unit_parameters.md)
- [AUHipass Parameters](audiotoolbox/1389948-auhipass_parameters.md)
- [AULowpass Parameters](audiotoolbox/1389999-aulowpass_parameters.md)
- [AULowShelf Parameters](audiotoolbox/1389995-aulowshelf_parameters.md)
- [AUHighShelfFilter Parameters](audiotoolbox/1389967-auhighshelffilter_parameters.md)
- [AUNBandEQ Filter Types](audiotoolbox/1389965-aunbandeq_filter_types.md)
- [AUNBandEQ Property IDs](audiotoolbox/1534022-aunbandeq-property-ids.md)
- [AUNBandEQ Parameters](audiotoolbox/1389745-aunbandeq-parameters.md)

### Effects

- [Effect Audio Unit Subtypes](audiotoolbox/1584154-effect_audio_unit_subtypes.md)
- [AUMatrixReverb Parameters](audiotoolbox/1389801-aumatrixreverb-parameters.md)
- [AUDistortion Parameters](audiotoolbox/1390086-audistortion-parameters.md)
- [Reverb Parameters](audiotoolbox/1390119-reverb_parameters.md)
- [Reverb Unit Parameters](audiotoolbox/1615024-reverb_unit_parameters.md)
- [AUReverbRoomType](audiotoolbox/aureverbroomtype.md)
- [Varispeed Unit Parameters](audiotoolbox/1390014-varispeed_unit_parameters.md)
- [AUDelay Parameters](audiotoolbox/1390010-audelay-parameters.md)
- [AUMultibandCompressor Parameters](audiotoolbox/1389781-aumultibandcompressor-parameters.md)
- [AUDeferredRenderer Properties](audiotoolbox/1534061-audeferredrenderer-properties.md)
- [AUSampleDelay Parameters](audiotoolbox/3547050-ausampledelay-parameters.md)
- [AUNewTimePitch Parameters](audiotoolbox/1389643-aunewtimepitch-parameters.md)
- [AUTimePitch, AUTimePitch (offline), and AUPitch Unit Parameters](audiotoolbox/1389946-autimepitch_autimepitch_offline.md)

### Input/Output

- [I/O Audio Unit Properties](audiotoolbox/1534116-i_o_audio_unit_properties.md)
- [Inter-App Output Unit Property IDs](audiotoolbox/1621039-inter-app-output-unit-property-ids.md)
- [Inter-App Audio Unit Property IDs](audiotoolbox/1621038-inter-app-audio-unit-property-ids.md)
- [Output Unit Parameters](audiotoolbox/1389916-output_unit_parameters.md)
- [AUNetReceive Properties](audiotoolbox/1534109-aunetreceive-properties.md)
- [AUNetSend Properties](audiotoolbox/1534207-aunetsend-properties.md)
- [AUNetSend Parameters](audiotoolbox/1389633-aunetsend-parameters.md)
- [AUNetReceive Parameters](audiotoolbox/1389920-aunetreceive-parameters.md)
- [AUNetSendPresetFormat Properties](audiotoolbox/1534212-aunetsendpresetformat-properties.md)
- [Net Status Audio Unit Parameters](audiotoolbox/1389891-net-status-audio-unit-parameters.md)
- [I/O Audio Unit Function Selectors](audiotoolbox/1585807-i_o_audio_unit_function_selector.md)
- [AudioOutputUnitMIDICallbacks](audiotoolbox/audiooutputunitmidicallbacks.md)
- [AudioOutputUnitStartAtTimeParams](audiotoolbox/audiooutputunitstartattimeparams.md)

### Generators

- [AURandom Parameters](audiotoolbox/1389639-aurandom-parameters.md)
- [AUSampler Parameters](audiotoolbox/1389769-ausampler-parameters.md)
- [AUSampler Property IDs](audiotoolbox/1534086-ausampler-property-ids.md)
- [AUSampler Properties](audiotoolbox/1533959-ausampler-properties.md)
- [AURogerBeep Parameters](audiotoolbox/1389727-aurogerbeep-parameters.md)
- [AUMIDISynth Properties](audiotoolbox/1534190-aumidisynth-properties.md)
- [AURoundTripAACParam Parameters](audiotoolbox/1389808-auroundtripaacparam-parameters.md)

## See Also

### Audio Units

- [Generating spatial audio from a multichannel audio stream](audiotoolbox/generating-spatial-audio-from-a-multichannel-audio-stream.md)
- [Audio Unit v3 Plug-Ins](audiotoolbox/audio-unit-v3-plug-ins.md)
- [Audio Components](audiotoolbox/audio-components.md)
- [Audio Unit v2 (C) API](audiotoolbox/audio-unit-v2-c-api.md)
- [Audio Unit Voice I/O](audiotoolbox/audio-unit-voice-i-o.md)