Hey mario -
Did you ever complete this mod? If you have RGB through the AV multiout, you have to have sync in order for it to work. I am *pretty* sure that the N64 would output the sync signal for you via that multiout, and you could therefore tap it off of that.
You could always use an LM1881 chip to get the sync signal off of the composite output and use that with the RGB in order to complete the mod.
gamesx has a page for it - http://www.gamesx.com/rgbadd/n64rgb.htm
How to add S-Video to your N64 (For home console use)
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