I recently acquired an old Ampeg GV22. The amp has two channels. It also has reverb, tremolo AND vibrato. There is a switch that enables you to select which you want--tremolo or vibrato (i.e., only part of the trem/vibrato circuit can be active at any given time). A 2 button footswitch is provided - one for reverb the other for the trem/vibrato circuit. The reverb wasn't working when I got it, but I've subsequently got it working (with an assist from Doug Roccaforte)...I think. Here's Joe Piazza's version of the schematic. Based on this schematic, should the reverb work on both channels? I'm thinking, no...it only works on channel 1 (this seems weird...but then, it's a weird amp!) It also looks like the pre-amp out may only be for channel 2. Now...I'm also thinking that it might be reasonable to expect a bit more gain from Channel 1 as it's going through both the reverb and the trem/vibrato circuit. Of course, if I'm actualy correct here (not a great bet), you must stop thinking of me as a complete technical lame-o and instead can begin thinking of me as a partial technical lame-o. :BEER Note that in the schematic, Channel 2 is on top with Channel 1 below.