I am working on it alone for the moment (ISO only). I just received my freeduino kit, it's not soldered yet.
The code for the moment compile but is not tested, it's in the google project, code/trunk.
I soldered small wires on the MC and will solder them on a proto PCB, yep it's small!
I made a cable but if you know what to do, no problem with just tacking the signal from the wire before the plug.
Check also the wiki in the google project.
opengauge - Google Code