SOUND_MIXER_SYNTH  822 include/uapi/linux/soundcard.h #define SOUND_MASK_SYNTH	(1 << SOUND_MIXER_SYNTH)
SOUND_MIXER_SYNTH  854 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_SYNTH		MIXER_READ(SOUND_MIXER_SYNTH)
SOUND_MIXER_SYNTH  884 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_SYNTH		MIXER_WRITE(SOUND_MIXER_SYNTH)