I am getting ready to help a friend hook up his new Onkyo and Sony DVD player. He has a 27" TV with RF only input. If I run everything through the receiver than I am relegated to using the VCR tuner for watching regular cable TV? I plan to use an RF modulator to take the video from the Receiver to the TV. That will render the TV tuner useless, will it not? I would think I would have to try and use some sort of A/B switch or something to still use the TV tuner. Any thoughts?