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Technical Notes: Music & 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, rate conversion routines, and other services. Core MIDI provides a hardware abstraction layer and MIDI routing.

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Device input using the HAL Output Audio Unit (HTML)
TN2091: How to get input from an audio device by using the HAL's Output Audio Unit.
2004-08-23
Handling Audio Unit Events (HTML)
TN2104: This technote explains how to handle AudioUnit Events
2004-02-16
The System Sound APIs for Mac OS X 10.2, 10.3 and later (HTML)
TN2102: Discusses the System Sound APIs for correctly playing Alerts and User Interface Sound Effects
2004-07-13
Using the 3DMixer Audio Unit (HTML)
TN2112: Discusses how to use Core Audio's 3DMixer version 2.0
2004-06-14