Do you think that 8 bit sound sucks? Well think again after you see this AVR based 8 bit syntheser. Chipophone has been housed in to old electric organ to give it a second life.
So here are some details. It is ATmega88 based and is able to produce 38kHz multichannel sound that can be modified in many ways. All inputs are processed by separate microcontroller, which produces MIDI signals that then are played by mentioned above MCU. It is pretty complex project but it is fun to watch it playing. IT sounds identical to old video games like Super Mario.