Audio 组成
0.直接操作Mixer API 速度会比 waveform audio api速度要快
1.Mixer api 控件范围要比waveform audio api 要快.
2.Mixer api灵活，可以自行控件。
The Audio Device Manager is a common name for the OS code between applications using the waveform audio API and audio device drivers. It manages audio devices, includes the software-based mixer in the kernel, and handles various aspects of security, inter-process communication, application callbacks.
