One Control Black Loop 2-loop Switcher Pedal Use as an AB box Features a tuner output/mute switch Use as a channel switcher for your amp Offers true-bypass operation The Black Loop is a 2 Loop true bypass switcher with two DC outs It can be used as an AB Switch, Amp Channel Switcher or Tuner Output/Mute Switch Players can connect multiple pedals into each loop to create two independent effect chains The Black Loop is a great solution for bypassing vintage effect while not in use