You misunderstood his email. That's not exactly what he was saying. The software DOES NOT work with an off-the-shelf RH450. Maybe I didn't post this before, but I've already tried it with mine, and the software never connects.
This is a two part rig, you need BOTH the tweaker software AND the special firmware in the RH450. I believe Uffe's point was only to say no hardware modifications were necessary. Trust me, I'm not just spewing assumptions here. If you don't believe me, try it for yourself.
Also, a general point, it's only a MIDI cable if it's MIDI running on it (which we don't know). It's just a 5 pin cable that adheres to a Link Removed standard. Bottom line, until we know otherwise from Uffe, it's just a serial interface running the MIDI bitrate using the same kind of line drivers MIDI interfaces use (since it mates with the MIDI interface we were given). Other than that, we don't know what protocol it's running, and I wouldn't necessarily assume MIDI.
I don't mean to nitpick on this last point, but I just want to be careful we're only saying exactly what we know and accurately. People are gonna' read our posts and start their imagination churning with possibilities. This is a good thing, but we don't want to spin off in a direction founded on a bad assumption.
For example, if they were running the MIDI protocol, then it would clearly have been their intent to integrate with things that know how to speak MIDI to devices and control things. Otherwise, they could just be using a MIDI interface as a convenient way to have an opto-isolated serial interface available, which could be running something completely proprietary, geared specifically for their needs, in which case integration with actual MIDI controller devices wouldn't be viable.