Can I use the 990 on screen setup menu or do I need to connect it to a display to program?
The 990's setup menu does not appear on the front panel, so you need
some sort of video display connected via an analog video monitor output.
With the xbox and Bluray, do I need to take the HDMI to the 990 or can I take them straight to the projector?
Will the 990 do anything to the signal besides allowing me switching capability?
You don't have to run the HDMI signals through the 990, but doing so will give you two benefits: it will require just one long HDMI cable to your projector, and it will automate your video switching (when you pick the 990's input, it will switch the video for you).
The 990's DVI switching is a purely passive system: no video overlays are added, no processing applied. The benefit is purely one of convenience. Since a lot of projectors only have a single HDMI input, though, you may need a switch anyway - and the 990 includes one already.
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