I quickly hacked a MIDIbox based firmware for the Stribe project, and already had a lot of fun with it in conjunction with Reaktor.
The released firmware is available in the MIOS download section
Temporary updates can be found in the Repository
Reduced MBHP_CORE circuit for Stribe board (can be soldered on the prototyping area). The Arduino modules are not required for this solution.
More #1
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The firmware is currently running on a PIC18F452, but