SOUND_MIXER_ENHANCE 847 include/uapi/linux/soundcard.h #define SOUND_MASK_ENHANCE (1 << SOUND_MIXER_ENHANCE) SOUND_MIXER_ENHANCE 871 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_ENHANCE MIXER_READ(SOUND_MIXER_ENHANCE) SOUND_MIXER_ENHANCE 901 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_ENHANCE MIXER_WRITE(SOUND_MIXER_ENHANCE)