One Control 1 Loop Box Minimal AB Box Passive Switchable Loop Pedal Use the One Control Minimal AB Box to control the direction of your signal path in order to select amps, mute your signal, control what effects youd like to use, and various other uses 1) Amp Selector The AB Box has one input and two outputs Plug your guitar into the input and then run out from the A and B outputs to your desired destination 2) Input Selector The Minimal AB Box can also be used as an input selector