AVAudioRecorder is also built on top of Audio Queue Services. It provides capability to:

• Record until user stop the recording
• Record for a specified duration
• Pause and resume recording
• Audio-level metering

AVAudioPlayer makes easy to playback the audio data from local files and memory. It is built on top of Core Audio’s C-based Audio Queue Service. It provides all core functions we can find in Audio Queue Service.
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