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# Audio Unit

Add sophisticated audio manipulation and processing capabilities to your app.

## Overview

The Audio Unit framework provides interfaces for hosting either version 2 or version 3 audio units and implementing version 3 audio processing plug-ins known as Audio Unit extensions. Developers implementing version 3 audio units should subclass the <doc://com.apple.documentation/documentation/AudioToolbox/AUAudioUnit> class.

Version 3 Audio Unit extensions can be used on iOS, tvOS, and macOS by host apps and distributed via the App Store.

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