SOUND_MIXER_VOLUME  819 include/uapi/linux/soundcard.h #define SOUND_MASK_VOLUME	(1 << SOUND_MIXER_VOLUME)
SOUND_MIXER_VOLUME  851 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_VOLUME		MIXER_READ(SOUND_MIXER_VOLUME)
SOUND_MIXER_VOLUME  881 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_VOLUME	MIXER_WRITE(SOUND_MIXER_VOLUME)