---
title: Audio Unit Constants
framework: applicationservices
role: collectionGroup
path: applicationservices/speech_synthesis_manager/1552263-audio_unit_constants
---

# Audio Unit Constants

Constants that identify values in a speech synthesis audio unit.

## Topics

### Constants

- [kAudioUnitSubType_SpeechSynthesis](applicationservices/kaudiounitsubtype_speechsynthesis.md)
- [kAudioUnitProperty_Voice](applicationservices/kaudiounitproperty_voice.md)
- [kAudioUnitProperty_SpeechChannel](applicationservices/kaudiounitproperty_speechchannel.md)