uaudio_mixer_feature_get_bmaControls
mmask = uaudio_mixer_feature_get_bmaControls(d, 0);
chan, uaudio_mixer_feature_get_bmaControls(d, chan));
cmask |= uaudio_mixer_feature_get_bmaControls(d, chan);
if (uaudio_mixer_feature_get_bmaControls(d, i) & fumask)
static uint32_t uaudio_mixer_feature_get_bmaControls(