I have used a Morley ABY switch to route 2 guitars to 1 amp for about 20 years. For that application they are hard to beat. Quiet, transparent, built to last, and reasonably priced. I just got one for my wife (bass player) to switch between 2 basses (alternate tuning) and she has been quite pleased with it. For our use only one button (A or B) gets used. Stepping on the wrong button (A and B) may cause feedback, but you learn quickly which button to use. I have never used the Morley ABY switch to switch one guitar between 2 amps so I can't speak to that.