Maybe someone can help me with this. When I try to run my amps in a stereo rig for some reason one of them starts to squeal as soon as you take it off stand-by. I've been running two amps for years but this one particular amp seems to not like the idea. If I unplug the second amp she's fine. What cause's this? Grounding issues? I run the amps through my pedalboard with a Gig-fx Chopper splitting the signal at the end of the chain.Every other amp I've run through this set up has worked before.