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# fullStateForDocument

A persistable snapshot of the audio unit’s properties and parameters, suitable for saving in a user’s document.

```
var fullStateForDocument: [String : Any]? { get set }
```

## Discussion

Hosts may use this property to save and restore the state of an audio unit being used. Some state, such as a parameter value, is suitable for saving in a user preset. Other state, such as a synthesizer’s primary tuning setting, could be considered global state suitable for saving in a user document.

Subclasses that do not implement this property interface with the [`fullState`](/documentation/AudioToolbox/AUAudioUnit/fullState) property instead.

This version 3 property is bridged to the version 2 `kAudioUnitProperty_ClassInfoFromDocument` API.

---

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