you want it to loop back onto itself? if so then wind up the fx pot on channels one and two and it will feed its own signal back onto itself. have your fx send at about 2 oclock, are you seeing signal on the return channels? the fx send i would say is wired post fade inside the desk so try putting the channel pots to unity (0db).
what r u using to send signal to the fx unit? are you pluging into the desk then with guit or mic or something, then dialing up the fx pot on that channel? which routes it through to the fx out, then return it to one of your other channels?
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