SOUND_MIXER_SPEAKER  824 include/uapi/linux/soundcard.h #define SOUND_MASK_SPEAKER	(1 << SOUND_MIXER_SPEAKER)
SOUND_MIXER_SPEAKER  856 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_SPEAKER	MIXER_READ(SOUND_MIXER_SPEAKER)
SOUND_MIXER_SPEAKER  886 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_SPEAKER	MIXER_WRITE(SOUND_MIXER_SPEAKER)