Boss AB-2 2-Way Selector A 2-way selector that makes changing inputs or outputs easy One stomp is all it takes to instantly switch between 2 guitars or effects setups, change amplifiers or switch between an amp and tuner Rock-solid BOSS construction The BOSS AB-2 is a 2-way selector pedal that makes changing inputs or outputs easy One stomp is all it takes to instantly switch between 2 guitars or effects setups, change amplifiers or switch between an amp and tuner