The True-Path ABY box from Fulltone can't be compared with any other ABY switcher on the market. True-Path ABY-ST is the version with silent soft touch footswitches. Because of the unique 1:1 nickel core custom-wound transformer, the True-Path ABY box ensures switching without any pops, ticks or switching noises. Using the most advanced 4 opto switching system ever, yet also offering the purest signal. The used cells only have around 50 ohms series resistance compared to the Vactecs (which all other optocoupler switchers use) offering 300 - 400 ohms of series resistance to your guitar's signal.