Описание тега audioqueue

Audio Queue Services is high level. It lets your application use hardware recording and playback devices (such as microphones and loudspeakers) without knowledge of the hardware interface. It also lets you use sophisticated codecs without knowledge of how the codecs work.

At the same time, Audio Queue Services supports some advanced features. It provides fine-grained timing control to support scheduled playback and synchronization. You can use it to synchronize playback of multiple audio queues and to synchronize audio with video.

Ref Link: https://developer.apple.com/library/mac/#documentation/MusicAudio/Conceptual/AudioQueueProgrammingGuide/Introduction/Introduction.html