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# AUAudioUnitPreset

A class that describes an interface for custom parameter settings provided by the audio unit developer.

```
class AUAudioUnitPreset
```

## Overview

These presets often produce a useful sound or starting point.

For more details on working with Audio Unit presets, see [Audio Units - How to correctly save and restore Audio Unit presets.](https://developer.apple.com/library/archive/technotes/tn2157/_index.html#//apple_ref/doc/uid/DTS40011953) Note that the version 3 [`fullState`](/documentation/AudioToolbox/AUAudioUnit/fullState) property is bridged to the version 2 `kAudioUnitProperty_ClassInfo` API. Similarly, the version 3 [`fullStateForDocument`](/documentation/AudioToolbox/AUAudioUnit/fullStateForDocument) property is bridged to the version 2 `kAudioUnitProperty_ClassInfoFromDocument` API.

## Topics

### Preset Properties

[`name`](/documentation/AudioToolbox/AUAudioUnitPreset/name)

The preset’s name.

[`number`](/documentation/AudioToolbox/AUAudioUnitPreset/number)

The preset’s unique numeric identifier.


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