[sdiy] MIDI processor - power from midi in?

[David Brown]

I am intrigued by the ATTINY2313 which is a 20 pin part which will 
operate down to 2.7 volts.  Since it is compatible with all of the 
AVR parts, I was able to port my code from my keyboard 
microcontroller http://modularsynthesis.com/kurzweil/kurzweil.htm

I now have a full midi-in to midi-out command parser running and a 8 
bit data pins available.  So far I am just doing simple midi 
transformations such as note transpose, note invert, and channel 
transpose.  I'd like to power this off the midi in connector and 
think it will be pretty simple to do.  Anyone done this?

I'm thinking of using the bits for command selects and using this 
processor to split keyboards, add additional midi notes on separate 
channels, etc.

Dave