Global Variable


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


const AVAudioSessionCategory AVAudioSessionCategoryAmbient;


This category is also appropriate for “play along” style apps, such as a virtual piano that a user plays while the Music app is playing. When you use this category, audio from other apps mixes with your audio. Your audio is silenced by screen locking and by the Silent switch (called the Ring/Silent switch on iPhone).