---
title: kAudioOutputUnitStopSelect
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudiooutputunitstopselect
---

# kAudioOutputUnitStopSelect

Used by the system to stop an I/O audio unit when you call the AudioOutputUnitStop(_:) function.

## Declaration

```swift
var kAudioOutputUnitStopSelect: Int { get }
```

## See Also

### Constants

- [kAudioOutputUnitRange](audiotoolbox/kaudiooutputunitrange.md)
- [kAudioOutputUnitStartSelect](audiotoolbox/kaudiooutputunitstartselect.md)