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Technical Notes
System-level services in Mac OS X streamline the development process for audio developers, as well as for application developers who want to incorporate music and other audio media into their products. Core Audio provides native multichannel audio in a manner scalable for future high-resolution formats. The Audio Unit API provides a plug-in architecture for both DSP (audio in/audio out) and virtual instruments (MIDI in/audio out). MIDI services provide multiport MIDI capability.
Music & Audio Resources
A guided introduction and learning path for developers new to Mac OS X music and audio.  
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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.
 Core Audio 2004-08-23
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
 Carbon, Core Audio 2004-07-13
Using the 3DMixer Audio Unit (HTML)
TN2112: Discusses how to use Core Audio's 3DMixer version 2.0
 Carbon, Core Audio, Games 2004-06-14
Handling Audio Unit Events (HTML)
TN2104: This technote explains how to handle AudioUnit Events
 Carbon, Cocoa, Core Audio 2004-02-16
SndPlayDoubleBuffer and Carbon (HTML) (PDF) ()
TN1198: Removal of the SndPlayDoubleBuffer and other APIs from the Carbon API set and Carbon solutions.
 Carbon, Games, QuickTime 2002-06-12