Cannot set iOS device volume to 0 when Voice-Processing I/O unit is active
Understand iOS volume constraints when the Voice-Processing input/output unit is active.
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When using an iOS device and the Voice-Processing I/O unit is active, you cannot set the volume of the iOS device to 0. For more information, see the Apple developer documentation on
AVAudioSessionCategoryPlayAndRecordAVAudioSession.outputVolume