Teenage Engineering Op-1 Accessory Kit One SizeThe OP 1 Accessory kit takes the immense power of the OP 1 and gives it a convenient boost with thoughtful add ons that help streamline the creative process. The FM Antenna can be used to pick up radio signals and use them as an audio source. The bender (along with a rubberband) can be used to create a pitch bender on the orange knob. The crank allows for smoother movement of the main control knobs. The brick shaft sits on top of the control knob and