---
title: AUAudioUnitBusType
framework: audiotoolbox
role: symbol
role_heading: Enumeration
path: audiotoolbox/auaudiounitbustype
---

# AUAudioUnitBusType

## Declaration

```swift
enum AUAudioUnitBusType
```

## Topics

### Constants

- [AUAudioUnitBusType.input](audiotoolbox/auaudiounitbustype/input.md)
- [AUAudioUnitBusType.output](audiotoolbox/auaudiounitbustype/output.md)

### Initializers

- [init(rawValue:)](audiotoolbox/auaudiounitbustype/init(rawvalue:).md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.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)