the main idea is to choose which preamp you want to run, gate everything, put some effects on it, use the JVM's reverb and put the final signal into both poweramps, which have different characteristics
add another amp into the mix, while staying within the spirit of the original idea things become VERY complicated
when you pan left and right you'll hear the seperate poweramps with their own pair of speakers... but i can't remember which side is which amp
funny thing is that i had to cope with phase issues... it turned out, that the AFD's loop recovery inverted the signal coming from the JVM's preamp out and both poweramps were exactly 180 degrees out of phase of eachother... for the recording i had to use a DI box with a customised XLR-jack cable into the AFD's return, so it would flip the phase before it went into the AFD's return... the AFD's recovery stage then flipped it again, so both amps were in phase... i have to thank santiago for the info on that one