my Duo-R is RGB modded, and like I mention, I use the composite a/v cable that was sent with the console.
Joe's right on the money. One thing I can attest to is the ground in some areas of Splatterhouse, mainly the chapel on Stage 4 where you fight the boss. The floor is fuzzy, and looks kind of....i'm gonna say "rainbow-ish", because it has several colors when it scrolls. It's odd. Doesn't detract from the play though.