SOUND_MIXER_MIC
type = SOUND_MIXER_MIC;
idat &= (1 << SOUND_MIXER_MIC) | (1 << SOUND_MIXER_IGAIN);
#define SOUND_MIXER_READ_MIC MIXER_READ(SOUND_MIXER_MIC)
#define SOUND_MIXER_WRITE_MIC MIXER_WRITE(SOUND_MIXER_MIC)
#define SOUND_MASK_MIC (1 << SOUND_MIXER_MIC)