The Audible Disease Synth Bomb SB-1 is a simple yet fun to use hand-held monophonic synthesizer that produces an almost boundless array of sounds! Just plug it in and you're ready to start making some severe noise. The SB-1 incorporates four square-wave oscillators running in parallel. The frequency of each oscillator can be controlled by how much light is hitting each of the four photo-eyes... the more light that hits the photo-eye the higher the frequency of that oscillator. Cover the photo-eyes with your fingers for a virtually endless palate of sound! Oh, did we mention that this thing is loud? Well, it is!