Thank you Bob. I will get a waveform monitor to test the black. As soon as possible I am planning on replacing the old mixer with a newer one, but until then I’ve got to work with what I have. I’ve been placing the gen-lock cable in different slots on the KM-1200 the BB, the Sync and Gen-lock/5. I can get one CCU to become steady in Gen-lock/5 but when I try to loop from gen-lock out on the CCU to the Gen-lock in on the other, I can’t get a clear picture. So this week I’m going to check the signal in the Waveform monitor.