I have built a temperary system for WWE tomorrow. I have an amp running my subs, another running four speakers to cover part of the floor and then a send to my main board for the main cluster. What I figured to do was feed the subs off the left main, the floor speakers from the right and the feed to the main board from the center master. For some reason I couldn't get anything from the center feed. I instead assigned the channels to group one and fed the main feed from there. It works but I don't understand why I am not getting anything from the center fader. Any ideas?