---
title: kAudioUnitSubType_Varispeed
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudiounitsubtype_varispeed
---

# kAudioUnitSubType_Varispeed

An audio unit that can control playback rate. As the playback rate increases, so does pitch. This subtype provides a generic view, making it suitable for UI and programmatic context. macOS provides realtime and offline audio units of this subtype.

## Declaration

```swift
var kAudioUnitSubType_Varispeed: UInt32 { get }
```

## See Also

### Constants

- [kAudioUnitSubType_AUConverter](audiotoolbox/kaudiounitsubtype_auconverter.md)
- [kAudioUnitSubType_AUiPodTimeOther](audiotoolbox/kaudiounitsubtype_auipodtimeother.md)
- [kAudioUnitSubType_DeferredRenderer](audiotoolbox/kaudiounitsubtype_deferredrenderer.md)
- [kAudioUnitSubType_Merger](audiotoolbox/kaudiounitsubtype_merger.md)
- [kAudioUnitSubType_MultiSplitter](audiotoolbox/kaudiounitsubtype_multisplitter.md)
- [kAudioUnitSubType_NewTimePitch](audiotoolbox/kaudiounitsubtype_newtimepitch.md)
- [kAudioUnitSubType_RoundTripAAC](audiotoolbox/kaudiounitsubtype_roundtripaac.md)
- [kAudioUnitSubType_Splitter](audiotoolbox/kaudiounitsubtype_splitter.md)