本文详细介绍了iOS平台上的混音技术实现方式，包括AudioUnit的使用场景，如同时进行音频输入输出（例如VoIP）、合成声音的即时播放（适合游戏等应用场景）以及特定AudioUnit的功能（如混音）。此外还探讨了AudioUnit的组成结构、连接方式，并提供了一个包含多个AudioUnit（多通道混音器和远程I/O单元）的混音主机示例项目。
## iOS混音问题##
1. reading document: Audio Unit Hosting Guide for iOS
* audio processing graph
* when to use Audio Unit ?
When you want to use simultaneous audio I/O: e.g VOIP
responsive playback of synthesized sounds ( like for gaming )
features from a specific Audio Unit ( in my case, it is mixing )
* I/O unit
remote I/O unit: sample code: ioHost/auioHost
voice-processing I/O unit: extended from remote I/O, acoustic, for VOIP, including muting, gain control, voice-processing quality.
* scope & element
an audio unit is made of scopes + elements ( AKA bus)
scope=input/output/global
element is nested in scope
* audio unit connection
Q: what is this ?
2. MixerHost sample project
* 2 audio units
multi-channel mixer
remote I/O unit
3. others
别人对audio tool box的学习笔记： http://mechenwei3.iteye.com/blog/1175543
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