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# allParameterValues

Special read-only property for KVO.

```
var allParameterValues: Bool { get }
```

## Discussion

KVO notifications are issued on this property in response to certain events where potentially all parameter values are invalidated—for example, the selection of a preset.

## See Also

[`fullState`](/documentation/AudioToolbox/AUAudioUnit/fullState)

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


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