SOUND_MIXER_NRDEVICES
com < MIXER_READ(SOUND_MIXER_NRDEVICES)) {
com < MIXER_WRITE_R(SOUND_MIXER_NRDEVICES)) ||
com < MIXER_WRITE(SOUND_MIXER_NRDEVICES))) {
com < MIXER_WRITE(SOUND_MIXER_NRDEVICES))