Anyone try this? I have three modulated channels going around the house and would like to tune those channels into a system with component switching and digital audio only. It's a stretch, but I wonder if Sony included the horsepower to upconvert all those signals?

what are you talking about?

If I understand correctly, you have 3 open channels that you've created to accept your own broadcasts, like from security monitors. If this is a correct understanding, I can't think of any reason why you couldn't send broadcasts on these open channels from a VCR, DVD player or DVDR. For the component aspect, you would have to run component out from the source to the monitors or whatever you were using. Certainly a lot more expensive than running coax. As for sending digital audio, as long as that is what you're outputting, it would be carried on a digital coax cable as well, unless you were running optical. It sounds like you have a Sony upconverting DVD player. The limiting factor probably would be the same problems encountered with using an HDMI or DVI switch over a long cable run. You might need an amplifier. I'm no way an expert in all this but it seems like simple logic to me.

Why don't you do it and let us know if it works?

I tried it and it actually works! I ran the 480p component out into a Sony 40" XBR LCD, a VCR to line 1 in and an off air antenna to the VHF/UHF antenna input. I cannot comment on the picture quality as antenna signal is poor. It also passed the audio through on the coax digital connection.

May solve some problems for you if you need to see legacy modulation or other low res source.