I have run into a problem. The HD box only has a single regular audio output (if you disregard the digital output and spdif). I wanted to do the following
Split the cable - one goes to the HD box, one goes to the TIVO. This allows the TIVO to record things and not be a slave to the HD box. I wanted an output from the HD Box to go to the TIVO so I could record things (in sd from the hd box)
Maybe put the $12.95 monthly fee towards renting a HD PVR, then you can record HD as well. Although the HDD might not be as big, but it might save a lot of headaches.