Swissonic ZM 4

Total gain of line inputs to outputs ( gain and volume pots all way up ! ) is only about 3db,but mic input distorts when income signal is higher than 18 mV.
Gain regulation on channel is not real gain-it is more like another volume regulation in serial with existing volume regulation on channel.
So if you have any audio source with level beetween 18 mV and 1,2V there is no way to process it correctly and without distortion through zm4 .
Output meters are also semi-useless. When first red led is lightning there is still no full output level,when the second red light is on the output is near +2db.