---
title: AVAudioSessionRouteChangePreviousRouteKey
framework: avfaudio
role: symbol
role_heading: Global Variable
path: avfaudio/avaudiosessionroutechangepreviousroutekey
---

# AVAudioSessionRouteChangePreviousRouteKey

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

## Declaration

```swift
let AVAudioSessionRouteChangePreviousRouteKey: String
```

## Discussion

Discussion The value for this key is an AVAudioSessionRouteDescription object that describes the audio route settings prior to the route change.

## See Also

### User Info Keys

- [AVAudioSessionRouteChangeReasonKey](avfaudio/avaudiosessionroutechangereasonkey.md)