UNITY_GAIN
if (sgain > UNITY_GAIN)
gain = UNITY_GAIN;
(hdspm_read_pb_gain(hdspm, channel, channel)*64)/UNITY_GAIN;
gain = ucontrol->value.integer.value[0]*UNITY_GAIN/64;
all_in_all_mixer(hdspm, 0 * UNITY_GAIN);