Cassette. CRACKLE BOX , electronic synthesizer from the 70s.
The instrument was made to create live electronic music.
Musicians can stimulate the electrical circuits on the playing surface with the fingers of both hands. Depending on the position of the fingers as well as their pressure and humidity caused by short-circuits sounds and noises.
Circuit Vending Device.
Dysfunctional sound device done destroying a Bod Sponge toy.