AVAudioSession.Category

The category for an app in which sound playback is nonprimary—that is, your app can be used successfully with the sound turned off.

The category for using an audio hardware codec or signal processor while not playing or recording audio.

The category for routing distinct streams of audio data to different output devices at the same time.

The category for recording (input) and playback (output) of audio, such as for a VoIP (Voice over Internet Protocol) app.

The category for playing recorded music or other sounds that are central to the successful use of your app.

The category for recording audio; this category silences playback audio.

The default audio session category.