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# AVAudioSessionRouteChangePreviousRouteKey

A user info key that’s used to retrieve the previously active audio session route.

```
let AVAudioSessionRouteChangePreviousRouteKey: String
```

## Discussion

The value for this key is an [`AVAudioSessionRouteDescription`](/documentation/AVFAudio/AVAudioSessionRouteDescription) object that describes the audio route settings prior to the route change.

---

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