SOUND_MIXER_ALTPCM  829 include/uapi/linux/soundcard.h #define SOUND_MASK_ALTPCM	(1 << SOUND_MIXER_ALTPCM)
SOUND_MIXER_ALTPCM  861 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_ALTPCM		MIXER_READ(SOUND_MIXER_ALTPCM)
SOUND_MIXER_ALTPCM  891 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_ALTPCM	MIXER_WRITE(SOUND_MIXER_ALTPCM)