MIDI support for Android, over Bluetooth as well as USB, including a Fritzing
project that defines a simple Bluetooth MIDI interface.  Detailed discussion at
http://nettoyeur.noisepages.com/.

Acknowledgment: The implementation of the USB driver was done from scratch, but
the idea of writing a soft driver in Java came from Kaoru Shoji's
USB-MIDI-Driver (https://github.com/kshoji/USB-MIDI-Driver).