Maybe I'm over-thinking this. Perhaps a simple ABC box gets me where I'm looking to go? What I have: Joyo American Sound (AS), Joyo AC Tone (AC), and Joyo British Sound (Brit) These are my "amps". Clean, overdrive, lead. How I have them set up: Line 6 HX Effects FX Loop 1 Send into AS input, AS out into AC in, AC out into Brit in, Brit out into HX Effects FX Loop 1 Return. Main output of HX Effects goes to PA/powered speaker/FX loop return of any amp. The issue I have: turning one Joyo on and another off at times produces a very audible popping noise. This is annoying at home, and I can't imagine it would go over well at a gig or while recording. Back to the first line of this post - if I want to go from Clean to Lead at the tap of a button, what's the "best" way to do that? HX Effects can be set to toggle between its two FX Loops, though it doesn't get rid of the pop. Would any of these switch back and forth between the "amps" without making a pop? Boss LS-2 - seems nice, though I think I'd be limited to two of my three "amps". A/B box - only two of the three Joyos make it, and I'd have to find a way to combine two Joyo outputs into one HX Effects FX Loop Return input. Programmable loop switcher like Boss MS-3 or ES-5 and the like - seems like overkill, though maybe the only way to do it. MIDI hub like Morningstar - again, a lot of potential, though seems like overkill. I suppose could just choose one Joyo and run with it, though I like all three quite a bit.