Circuit bending is a technique of hacking eletronic circuits to make crazy stuff. Recently I started experimenting with this, as you can see in this video: a short sound jam made with a very simple and generic delay/reverb board modded to become a feedback noise generator,I also soldered an accidentally broken piezo contact microphone to the input to create some "percussive" attacks. The recording is simple, using an old brazilian Giannini Baguinho amplifier with a sm57 microphone.