I have written a special protocol that will generate the correct signals for the Sony DSP commands, but you need JP1 and a JP1 remote to use it. The 15-2103 requires a hardware mod to be JP1 compatible, but the 15-2104 is ready to go (and is being given away at RS for $10 a pop right now, if there are any left).

Rob
http://www.hifi-remote.com