SOUND_MIXER_IGAIN  831 include/uapi/linux/soundcard.h #define SOUND_MASK_IGAIN	(1 << SOUND_MIXER_IGAIN)
SOUND_MIXER_IGAIN  863 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_IGAIN		MIXER_READ(SOUND_MIXER_IGAIN)
SOUND_MIXER_IGAIN  893 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_IGAIN		MIXER_WRITE(SOUND_MIXER_IGAIN)