using pedals with rack gear



Question:  I have a Roland GP-8 preamp that does just about everything I want except for an acoustic simulator.  I bought a Boss AC-2 pedal off of ebay a while back and this solves my problem, but is there anyway to have the pedal hooked up through the roland so I can bring up the effect through the floor control unit?  There is a port in back for it, and I've seen diagrams of peoples rigs where this is done, but I just can't get it to work.