---
title: setAllToUnknown()
framework: coreaudio
role: symbol
role_heading: Instance Method
path: coreaudio/managedaudiochannellayout/setalltounknown()
---

# setAllToUnknown()

Sets all AudioChannelDescriptions to kAudioChannelLabel_Unknown.

## Declaration

```swift
mutating func setAllToUnknown()
```