Dear Dennis, About the only way that I know of doing this is to use a pair of stereo reverbs or a trio of stereo reverbs such that you'd end up with something like this: front of the audience front of the audience _ | | | | back of the audience back of the audience You'd probably want to make sure that all of the reverbs were the same model and mods to them and essentially they would each have an output to the front series of speakers and then an output to the rear as well. I've worked with the three reverb method using a set of Alesis MIDIVerbs which were all set to a soft ping pong effect. Flip side of this was trying to get everything all wired up outside of the house speaker/board system which everything else was going through at the time. As for getting a real surround sound set up or THX, I know that there is computer equipment out there for it, and at last go it was all rather expensive. Loop on, patch out! Lee-ohki.