Fairfield Circuitry Either/Or Expression ToggleThe Fairfield Circuitry Either Or joins in on the Fairfield utility series as a quick means to access different expression inputs. With momentary and latching footswitches, the Either Or accesses an internal 50k potentiometer to do things like swap between two different tremolo times, for example. For adding in that extra element of interactivity, use your freedom of choice!