I’m not going to pretend to know a thing about music, but it is easy to get excited after watching Linus Åkesson turn a two-bit organ into an 8bit chipophone. From Linus’ web site:
The Chipophone is a homemade 8-bit synthesizer, especially suited for live chiptune playing. It has been built inside an old electronic organ.
All the original tone-generating parts have been disconnected, and the keys, pedals, knobs and switches rerouted to a microcontroller which transforms them into MIDI signals. Those are then parsed by a second microcontroller, which acts as a synthesizer.
Video of the Chipophone
Thanks Gianni for tip.