They guys at fotosis have come up with a bizarre cardboard synth:
The keyboard is a simple enough affair as it is based on a simple circuit that involves a 555 timer chip to produce a square wave. The casing was created by laminating lots of layers of cardboard together using glue and wood screws. In the video below we are playing the keyboard into the ring modulator of one of our earlier instruments, Fotosis No. 003. The resulting sound is the effect of the square wave noise section from Fotosis No.003 being fed into the carrier input of the units ring mod. and keyboard on the main input.
The amplifier is actually three amps and three speakers in one box. The amps are LM386 chips providing 2.5 Watts each. This set up allows us to play three separate devices into the amp where each device will have its own input, volume control, amp and speaker.