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# Format settings

The audio settings that apply to all audio formats that the audio player and recorder classes support.

## Topics

### Settings

  <doc://com.apple.documentation/documentation/AVFAudio/AVFormatIDKey>

  <doc://com.apple.documentation/documentation/AVFAudio/AVSampleRateKey>

  <doc://com.apple.documentation/documentation/AVFAudio/AVNumberOfChannelsKey>


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