I've search around for a confirmation of the correctness of gamesx pinouts (http://www.gamesx.com/avpinouts/rgb21pinj.htm) and have found this:
http://dempa.jp/rgb/heaven/m_21p.html (http://dempa.jp/rgb/heaven/m_21p.html)
Everything matches except for the Audio IN Left and Right pins whose order here is reversed. I would assume that the latter link has the correct info since it's Japanese and all devoted to RGB matters. Anyone have anything to say about this?
Seems like something that'd take all of ten seconds to figure out. Let us know what you find. =)
I just cracked open my XRGB2+ manual and the pin-outs are listed as such
Left Audio: 1
Right Audio : 5
Composite Sync: 9
Red: 15
Green: 19
Blue 20
you've got the audio channels reversed your wiring diagram...apparently.
I'll update that immediately. Thanks for pointing it out!