Quilter Labs UFC-201-2 2-Position Selectable Foot Controller UFC-201-2 2-Position Selectable Foot Controller Use this foot controller with the MicroPro, and Steelaire series The Universal Foot Controller allows you to select any of the six functions for each of the two buttons Choose this controller if you want more flexibility in which functions you control It controls any of two of the following functions: Channel switching, Boost, Limiter, Tremolo, Reverb, and FX Loop