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# kAudioSession_RouteChangeKey_Reason

The reason for the audio route change.

```
let kAudioSession_RouteChangeKey_Reason: CFString!
```

## Discussion

A <doc://com.apple.documentation/documentation/CoreFoundation/CFNumber> object that identifies the reason for the audio route change. See [Audio Route Change Reasons](/documentation/AudioToolbox/1618380-audio-route-change-reasons).

---

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