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Leopard Articles
System-level Mac OS X services streamline the development process for audio developers, and for application developers who incorporate audio 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 and for MIDI-based virtual instruments. MIDI services provide multiport MIDI capability.
An introduction to audio development in Mac OS X.   Essential information for developers working with audio in Mac OS X.   C and Objective-C API references organized by framework.
Audio Topics
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Carbon
C APIs for creating, processing, and playing sound content. 		 
Cocoa
Object-oriented APIs for creating, processing, and playing sound content. 		 
Core Audio
Frameworks and tools for audio and MIDI data manipulation.
Performance
Facilities for improving performance when working with sound. 		 
QuickTime
A multiplatform technology for creating, processing, and playing sound content.