SOUND_MIXER_OGAIN  832 include/uapi/linux/soundcard.h #define SOUND_MASK_OGAIN	(1 << SOUND_MIXER_OGAIN)
SOUND_MIXER_OGAIN  864 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_OGAIN		MIXER_READ(SOUND_MIXER_OGAIN)
SOUND_MIXER_OGAIN  894 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_OGAIN		MIXER_WRITE(SOUND_MIXER_OGAIN)