---
title: muteStateKey
framework: avfaudio
role: symbol
role_heading: Type Property
path: avfaudio/avaudiosession/mutestatekey
---

# muteStateKey

Keys for outputMuteStateChangeNotification Value is NSNumber type with boolean value 0 for unmuted or value 1 for muted (samples zeroed out)

## Declaration

```swift
class let muteStateKey: String
```

## See Also

### Configuring audio muting

- [isOutputMuted](avfaudio/avaudiosession/isoutputmuted.md)
- [setOutputMuted(_:)](avfaudio/avaudiosession/setoutputmuted(_:).md)
- [outputMuteStateChangeNotification](avfaudio/avaudiosession/outputmutestatechangenotification.md)
- [userIntentToUnmuteOutputNotification](avfaudio/avaudiosession/userintenttounmuteoutputnotification.md)
- [userIntentToUnmuteOutputNotification](avfaudio/avaudiosession/userintenttounmuteoutputnotification.md)