Cool, and nice project.

 

I'd advise against it: I know perhaps the "wireless" thing is nice on stage, but in the end

a cable you can (usually anway!) rely on, while with bluetooth, I wouldn't be too sure.

I'll suggest two options:

A) Get a Arduino Uno (so you have the flashable USB chip), and make it appear as a class compliant USB MIDI device. ALSA will pick it up, and automatically list it as a MIDI I/O device. Done.

B) Use a hardware MIDI output from the Arduino: setting the serial baudrate to 31250 (midi baud rate), and writing the bytes you want using Serial.write() does the job. The hardware MIDI output is very simple: http://arduino.cc/en/uploads/Tutorial/MIDI_bb.png

Depending on if you interface has hardware MIDI I/O, B might be OK, and saves buying an Arduino Uno. That said, the simplicity of just plug & play USB MIDI anywhere is awesome!

HTH, -Harry

PS: I have python script to read serial data using the "PySerial" module, and turn that into ALSA MIDI somewhere... leftovers from a similar project :) That allows using the Decimilia as a USB MIDI device, so long as the python script is running. Note that its obviously not ideal: with Python being rubbish for speed, and its a very non-portable solution since the Py-ALSA-MIDI / PySerial modules aren't common.