---
title: kAudioOutputUnitRange
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudiooutputunitrange
---

# kAudioOutputUnitRange

The start of the numerical range for I/O audio unit function selectors.

## Declaration

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

## See Also

### Constants

- [kAudioOutputUnitStartSelect](audiotoolbox/kaudiooutputunitstartselect.md)
- [kAudioOutputUnitStopSelect](audiotoolbox/kaudiooutputunitstopselect.md)