Is there any way to force TiVo HD to record from the HD copy of a cable channel? For example, channel 4 is my local NBC station in analog; channel 716 is the HD feed of the same thing. The TiVo seems to keep recording shows off the non-HD channels, despite the fact that I have removed the channels under the Channel List. It was my understanding that the TiVo Series 3 was smart enough to figure out the difference between the SD and HD channels and prefer the HD ones, but this doesn't appear to be true. Is there something I need to set to force this? I am using 2 CableCARDs and the HD channels come in just fine and have guide data, but it never chooses to record from them.