I designed a MIDI synthesizer for the Atmega162. It's the controller I use to drive my DRSSTC, which is a cool type of solid state coil.
I am grateful for the PDF found here @ AvrFreaks that describes a bit about designing a MIDI controller.
My latest test was real entertainment for me. Here's the short clip. I like to think of it as an electric guitar. :wink: http://www.youtube.com/watch?v=k_KymmnrOQ4