I bought an RGB modded Duo off of eBay (from doujindance?) plus a component transcoder and an hdmi converter and neither work with the Duo or my consolized MVS system.
The thing is, both converters work with my unmodded Genesis systems and Neo Geo AES. I think that with the Neo Geo in component, there was an occasion distortion at the corner of the screen.
So be prepared to possibly run into my problem GUAGE. I'm not sure what to do now, since it was hard enough finding a scart to component transcoder at the time.