RegALiDigiMixer
WritePCI32(RegALiDigiMixer, ALiDigiMixerPCMIn);
reg = fDevice->ReadPCI32(RegALiDigiMixer);
fDevice->WritePCI32(RegALiDigiMixer, reg | (1 << _HWVoice()));
uint32 reg = fDevice->ReadPCI32(RegALiDigiMixer);
fDevice->WritePCI32(RegALiDigiMixer, reg & ~(1 << _HWVoice()));