Check out the Crazy Box
The crazy box has 10 inputs and 10 outputs, which in this video go out to 10 amplifiers. A photoresistor on each channel controls the signal levels. This is why the audio levels rises when the room lights are turned on. In other words, the more light, the louder the sound. Circuit bent devices are plugged into the 10 inputs. With the room lights off, you can use a flashlight to turn up the levels on individual channels. Videography be Andy Ben.