Hmm interesting enough, here is what i have.
HD
pack modded with a switch to toggle either pin 9 or pin 11 (vga or retail)
3 rca to bnc
using the original HD
pack wires RGB to connect both and using the L R to my amp system for sound (obviously)
I dont have the Sync Splitter mounted inside the HD
pack and i dont have nothing connected to the H & V behind the monitor.
Everything works very well (some games and apps are green but loading them from within XBMP or last version of XBMC works fine)
So with Xselect i just have XBMC as default dash so when i boot of my vga bios XBMC will be in true vga then i load whatever game i want (with some exeptions, splinter cell among others) and most of them come out with true vga