hello. i've got an old mcu and after having remplaced two faders and worked out how to get it up and running am delighted to see it light up finally !! except that the midi traffic is only one way - from logic to the mcu. it's tantalising to see the mcu respond when i move a control in logic but ultimately disappointing as this is the opposite of what i want. all the controls on the mcu are completely unresponsive (except the faders which zip back into the position reported by logic) i really do no not know what to do next, short of sending the mackie off to get some expensive diagnostics done on it which would be an expensive shame if there was nothing wrong with it. the midi leads are both fine, no problems there. the midi interface is a tascam us-600 and is selected for both midi in and out in the control surfaces configuration. the test system is a 2012 mbp with logic X.0.6 and mavericks but i'm seriously thinking of ditching mavericks. i have heard of others who have experienced the same mcu problem. maybe you know about it ? i hope you can help.