SOUND_MIXER_IMIX
{ AudioNrecord, SOUND_MIXER_IMIX },
#define SOUND_MIXER_READ_IMIX MIXER_READ(SOUND_MIXER_IMIX)
#define SOUND_MIXER_WRITE_IMIX MIXER_WRITE(SOUND_MIXER_IMIX)
#define SOUND_MASK_IMIX (1 << SOUND_MIXER_IMIX)