Electricity for Progress presents, Apple Distortion - an introduction to feedback and operational amplifiers. In this experiment, users are presented with three apples, touching these apples in various ways and combinations produces audible feedback. The feedback is produced using an old lm709 operational amplifier integrated circuit and an assortment of capacitors (including the human inter-actor). Handling and Grip affect tonal qualities to the sound produced. This device is meant to graph, in an audibly sensible way, the electrical properties and processes occurring inside the operational amplifier in self oscillation.