The Casio SK-1 is a popular target in the circuit bending community. The pictures below document the process of building a patchbay for the SK-1. I built it from a wooden box and some jacks. The jacks are connected to the pins of the CPU of the SK-1. When the jacks are connected/bridged then the pins of the CPU get connected to each other. This may cause the CPU to create interesting and unexpected sounds.