The Small Stone Nano Chassis Pedal from Electro-Harmonix is an analog phase shifter pedal which was first manufactured back in the early 70s and is for musicians looking for a fat, warm, analog phase shifter. This pedal has a Rate knob which adjusts the speed of the phasing sweep, and a Color Switch which changes the sound of the phase shift between a full and robust phase shift in the Down position to a more pronounced instance phase shift in the Up position.