I just started at a new high school with repeating circuits. I have never been in a repeating a system. We have an Ion board with Strand Dimmer Rack. How do I distinguish one set of circuit from another? For example; the cove position on house right has circuits 61a-66a while house left has 61b-66b, of course when I tell channel 61 thru 66@full it brings up both sides.