I agree with gonk about splitting the signal. There is a question I have. On my Denon 3805, I had no video hooked to it except for an S-Video "Monitor Out" connection to the Sammy for OSD. When you look at the rear panel on page 8 of the manual, there is a composite video out near the RS-232 jack labeled #8. I assume this should give the OSD. I will have no video inputs hooked to the 990 at all. I have a Dtronix 2 way DVD switch for Cable and DVD already installed.

Does this sound right about that composite connection for OSD or am I missing something?

I don't care about OSD during normal operation, just need OSD for accessing the menu for programming.