The robo-bass is somewhere between a washtub bass, a slide guitar, and a theremin. Played like a theremin, the instrument uses infrared proximity sensors to detect the player’s position and respond accordingly. One sensor determines pitch, and the other two determine when each of the two strings are struck. The sliding fret is controlled by a stepper motor, and the two strings are struck by solenoids. The position (and type) of the sensors is customizable, allowing for the player to use any combination of body parts to control the instrument. Because of its microcontroller construction, the robo-bass can also be scripted like a player piano.