when it is turned off the vga will pass through.
i use my xrgb2 plus on my HD dlp samsung tv. i run my dreamcast vga box to the vga pass through.
i think there is an option to have the unit auto sense an input and turn on to the port composite, s-video, ,component or rgb.... that can mess with you when trying to make sure it is off..
i run my neo-geo, genesis, duo , super grafx, and super gun, to the rgb input.
i run my nes to the composite, i run the snes,n64, saturn, dreamcast, 3do, cdi, and jag/jagcd, to the s-video input.
then i run my xbox, ps2 and gamecube to the component input. ps2 games look so much better now sharper and more vivid. it helps a lot with ps2 cuz most games are not progressive scan, unlike gamecube or xbox.
each of those sources except the rgb video have a selector box to use the tv native inputs or reroute every thing to the xrgb2 then back to the vga port on the tv.
this is needed mainly for the progressive scan games on the next gen systems and for the few systems that look worse.
jag, cdi, and 3do look bad going to the xrgb2.
the n64, snes,dreamcast(non vga games) and saturn look good. its odd how they are all using the svideo.
but the systems that look bad get some color bleeding/ghosting when used.
the xrgb is great on the hd tv it will get rid of the lag that a lot of HD tv create when up scanning interlaced video. the xrgb2 plus does the up scanning with no lag.