Umm, maybe try a stereo delay....I think they will bounce the delay back and forth between 2 amps....Just connect to 1 amp and jam...

Not sure if this is what your looking for, but it's worth a try...not sure why you'd want to delay your main signal either, but if that's what you want to do....

The best way in my opinion to get a thick "recording" kind of sound live is to use 2 amps and run in stereo....You'd be surprised at how much thicker your tone would be...I know this option can be pricey though...