Fred, we're talking about different things and I can't tell which of us went off the subject.

I'm saying that if you use a QAM modulator and you have a cable system, you'll have to be able to program your cable box to tune your selected channel, which your cable company isn't likely to do. I just realized there's a way around it, though, which is to connect the cable box using baseband connectors (HDMI) and run your signal with the QAM-modulated channels directly into the TV tuner. Of course, this gives you digital audio out of the cable box but, at best, ARC out of the TV for the modulated channels.

Anyway, it can be done.