I wanted to try this for years, but thought it would be too complicated; plus I never had an ABY switch box until recently: Dual FX systems in parallel. Just tried it. Using two humble Radio Shack y couplers, one for each amp (Blues Jr. and POS old Frontman). Each FX system is stereo; grays go to BJ & oranges go to POS [Hosa stereo cables]. With the ABY switch you can switch from one FX system to the other, or have both on together parallel. I haven't noticed any weirdness re: impedance, loading, added noise, etc. So far. I think it's good to go. Very cool & fun! Not all that complicated at all. P.S. You don't really need two amps. That's just what I prefer. P.S.S. Yes that is a pile of gross clothes etc. on the floor. Should have moved that! Later -- Dammit, there is some kind of loading issue. Didn't catch that until I turned the distortions off! :neutral: Maybe NG. Fun to play with though. Any easy solution? Ha, probably not.