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# rate

A value that changes the playback rate of the input signal.

```
var rate: Float { get set }
```

## Discussion

A value of `2.0` results in the output audio playing one octave higher. A value of `0.5` results in the output audio playing one octave lower.

The default value is `1.0`, and the range of valid values is `0.5` to `2.0`. Only the [`AVAudioEnvironmentNode`](/documentation/AVFAudio/AVAudioEnvironmentNode) class implements this property.

---

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