---
title: Audio Unit Filter Parameters
framework: audiotoolbox
role: collectionGroup
role_heading: API Collection
path: audiotoolbox/1390052-audio-unit-filter-parameters
---

# Audio Unit Filter Parameters

## Topics

### Constants

- [kMultibandFilter_Bandwidth1](audiotoolbox/kmultibandfilter_bandwidth1.md)
- [kMultibandFilter_Bandwidth2](audiotoolbox/kmultibandfilter_bandwidth2.md)
- [kMultibandFilter_Bandwidth3](audiotoolbox/kmultibandfilter_bandwidth3.md)
- [kMultibandFilter_CenterFreq1](audiotoolbox/kmultibandfilter_centerfreq1.md)
- [kMultibandFilter_CenterFreq2](audiotoolbox/kmultibandfilter_centerfreq2.md)
- [kMultibandFilter_CenterFreq3](audiotoolbox/kmultibandfilter_centerfreq3.md)
- [kMultibandFilter_CenterGain1](audiotoolbox/kmultibandfilter_centergain1.md)
- [kMultibandFilter_CenterGain2](audiotoolbox/kmultibandfilter_centergain2.md)
- [kMultibandFilter_CenterGain3](audiotoolbox/kmultibandfilter_centergain3.md)
- [kMultibandFilter_HighFilterType](audiotoolbox/kmultibandfilter_highfiltertype.md)
- [kMultibandFilter_HighFrequency](audiotoolbox/kmultibandfilter_highfrequency.md)
- [kMultibandFilter_HighGain](audiotoolbox/kmultibandfilter_highgain.md)
- [kMultibandFilter_LowFilterType](audiotoolbox/kmultibandfilter_lowfiltertype.md)
- [kMultibandFilter_LowFrequency](audiotoolbox/kmultibandfilter_lowfrequency.md)
- [kMultibandFilter_LowGain](audiotoolbox/kmultibandfilter_lowgain.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)
- [MIDI Audio Unit Parameters](audiotoolbox/1389613-midi_audio_unit_parameters.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)