https://www.thegigrig.com/aby-baby
TheGigRig ABY Baby is a powerful yet compact ABY splitter that offers a buffered or true-bypass A output, and an isolated, phase-reversible B output. It also features our own custom designed rugged OptoKick footswitches.
If you run two amps ABY Baby gives you complete control. Please see the website link above for full product details.