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Leopard Guides: Audio
Core Audio and Core MIDI are the Mac OS X audio and MIDI subsystems. Core Audio provides a hardware abstraction layer, an effects processing framework, data format conversion routines, and other services. Core MIDI provides a hardware abstraction layer and MIDI routing.

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Audio Queue Services Programming Guide (HTML) (PDF)
Describes how to play and record audio using Audio Queue Services.
2007-10-31
Audio Unit Programming Guide (HTML) (PDF)
Explains how to use Core Audio frameworks and the Core Audio SDK to create audio units.
2007-10-31
Core Audio Overview (HTML) (PDF)
Provides an overview of Core Audio and its programming interfaces.
2007-01-08