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# multiRoute

The category for routing distinct streams of audio data to different output devices at the same time.

```
static let multiRoute: AVAudioSession.Category
```

## Discussion

This category can be used for input, output, or both. For example, use this category to route audio to both a USB device and a set of headphones. Use of this category requires a more detailed knowledge of, and interaction with, the capabilities of the available audio routes.

> Important:
> Route changes can invalidate part or all of your multi-route configuration.  When using the ``doc://com.apple.avfaudio/documentation/AVFAudio/AVAudioSession/Category-swift.struct/multiRoute`` category, it is essential that you register to observe ``doc://com.apple.avfaudio/documentation/AVFAudio/AVAudioSession/routeChangeNotification`` notifications and update your configuration as necessary.

---

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