---
title: "AudioUnitUninitialize(_:)"
framework: audiotoolbox
role: symbol
role_heading: Function
path: "audiotoolbox/audiounituninitialize(_:)"
---

# AudioUnitUninitialize(_:)

Uninitializes an audio unit.

## Declaration

```swift
func AudioUnitUninitialize(_ inUnit: AudioUnit) -> OSStatus
```

## Parameters

- `inUnit`: The audio unit that you want to uninitialize.

## Mentioned in

Migrating Your Audio Unit Host to the AUv3 API

## Return Value

Return Value A result code.

## Discussion

Discussion Before you change an initialize audio unit’s processing characteristics, such as its input or output audio data format or its sample rate, you must first uninitialize it. Calling this function deallocates the audio unit’s resources. After calling this function, you can reconfigure the audio unit and then call AudioUnitInitialize(_:) to reinitialize it.

## See Also

### Initializing the Audio Unit

- [AudioUnitInitialize(_:)](audiotoolbox/audiounitinitialize(_:).md)
- [AudioUnitProcess(_:_:_:_:_:)](audiotoolbox/audiounitprocess(_:_:_:_:_:).md)
- [AudioUnitProcessMultiple(_:_:_:_:_:_:_:_:)](audiotoolbox/audiounitprocessmultiple(_:_:_:_:_:_:_:_:).md)
- [AudioUnitReset(_:_:_:)](audiotoolbox/audiounitreset(_:_:_:).md)
- [AudioUnit](audiotoolbox/audiounit.md)