Should be added soon:
- mute
- speaker/microphone resampling
To be added a little later:
- compression
- reverb
Needs to be added by someone else:
- coreaudio
- direct
- portaudio
- xaudio2
- js
* sound/nes_apu.cpp: Can no longer read from anything but status register.
nintendo/nes_vt*: Aligned PnP APU code with core changes.
nintendo/dkong.cpp: Fixed dkong3b crash regression.