I'm gonna search for a arduino project and i had the idea to built a Gamer Interface to controll all the thousend functions in Microsoft's Flight Simulator X.
for example if i press a button, connetcted to an input on arduino, the arduino should send a signal to the computer.
the computer converts this signal in a 'language' that the simulator understands for example a symple keyboardshortcut like Ctrl+W.
.. and your doing this by converting your interface into midi then from midi to keyboard short-cuts ?!