I've been visiting the JP1 folks lately over at hifi-remote.com, reading up on Makehex and DecodeIR and stuff like that. John Fine wrote those utilities and participates in both sites, but the other site is more technical oriented.

One of the guys over there has identified the special codes used by the DirecTv HR20-700 to process buried commands such as skip to tick, and slow play. I'm also hoping to figure out how to create clean codes for the AV1/AV2 setting for my 2nd recorder so I don't have to rely on learned codes. I also want to fiddle with the codes themselves and see if I can make the reception of the codes more reliable.

The hobbyists are just out to increase understanding and the power of these devices for everyone's benefit.