# kAudioUnitProperty_PresentPreset The active factory preset for an audio unit. ``` var kAudioUnitProperty_PresentPreset: AudioUnitPropertyID { get } ``` ## Discussion A read/write [`AUPreset`](/documentation/AudioToolbox/AUPreset) data structure valid on the audio unit global scope, The `presetName` field in the struct is of type and follows Core Foundation memory semantics. When setting the active factory preset on an audio unit with the [`AudioUnitSetProperty(_:_:_:_:_:_:)`](/documentation/AudioToolbox/AudioUnitSetProperty(_:_:_:_:_:_:)) function, you own the reference to the preset name and are responsible for later releasing it by calling the function. When obtaining the active factory preset from an audio unit with the [`AudioUnitGetProperty(_:_:_:_:_:_:)`](/documentation/AudioToolbox/AudioUnitGetProperty(_:_:_:_:_:_:)) function, you also own the reference to the preset name and are responsible for later releasing it by calling the function. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)