thanks for the tip... and you're right, this topic isn't the hotbed it was a few months back (as usual, i'm late to the party!)... currently, jim at key digital (a nice guy who has been very accessible and helpful) would like me to go ahead and have the cable company come out and try to install cable cards into the Tivo HD to see if it will handshake properly with the kd-pc2/507cmx... eventually, he wants me to send the card back to key digital to diagnose whether it's simply a bad unit, to test it with equivalent equipment to mine, and to repair/replace it... i'll post here what happens with the cable company (Wide Open West in Michigan) and the Tivo HD.
i wonder if key's external digital processor (Model# KD-VPHD2) offers equivalent signal processing capabilities and uses the same HDCP compliance algorithms as the kd-pc2... i suppose if the KD-VPHD2 can output native resolution for the 507CMX, but uses HDCP compliance algorithms that are compatible with my other equipment, then it might be an option through the 507CMX's DVI input... one of the original reasons i decided to go with Tivo rather than the cable company's DVR is that Tivo has the capability to pass content in its original resolution rather than scaling all output to the same resolution, thereby passing 480p from one channel and 1080i from the next, allowing 100% of the scaling/deinterlacing to take place on key digital equipment. this would avoid the double (or even triple) processing (set top box, key digital card, pioneer monitor). of course, that pipe dream was back before it became evident that the kd-pc2 doesn't actually output native resolution of the 507CMX, thereby necessitating at least double processing... if the KD-VPHD2 can output native resolution, that dream may still be a reality through the 507CMX's DVI input.