Blitz Lunar wrote:Whaaaa, I don't have that. If I'm looking at the right number then my driver version is 4.23.14.WDM

no Blitz Lunar. That's the "program" version of the S-YXG50 softsynth, which actually is NOT the latest version. the "driver" version number of S-YXG50 (Yamaha XG Softsynthesizer) is different than the "program" version and should be 5.13.2600.n if you view the version info in Device Manager. that I know for sure.
Ver. 4.23.14 WDM of S-YXG50 was released in late 2001 to address XP compatiblity issues. if you run this version on a non-XP OS like Win2000, its setup program will tell you that it requires XP and setup will quit. here's another shocker: if you run the S-YXG50 v4.23.14 WDM setup program in XP compatibility mode under Vista/Win7, the S-YXG50 setup window will display
a completely different version number - "Ver.4.01.10 Legacy" instead of "Ver.4.23.14 WDM"! shock, horror!
You can check this by viewing the contents of the setup.inx file in Notepad or Wordpad. I've ran that s-yxg50 4.23.14 wdm setup program in xp compatiblity mode on my mom's vista laptop to verify this and it shows a totally different version number than the usual one. weird.
UPDATE: Much of my suspicions of the S-YXG50 softsynth
have been confirmed of it not working well on XP machines with "multi core" [ex. dual-core/core duo, quad-core, etc.] AMD/Intel processors. If you're going to use the S-YXG50 WDM softsynth under XP, be sure to use it only under "single core" CPUs (Intel Pentium 3s/4s, AMD-K7 or perhaps Intel Core Solos). I think it's because the softsynth relies heavily on the cpu type and speed and will not work on certain processor types.
The VSTi version of S-YXG50 [released in mid-2003 and bundled in SOL2 and XGWorks ST softwares], however, doesn't depend on cpu type/speed.
btw, there is a way to use S-YXG50 VST through a 3rd party MIDI Player in Vista / Win7. check this page out (page is in French):
http://www.blueman.name/S-YXG50.php[requires the following programs: VSTHost, S-YXG50 VSTi, Maple Virtual MIDI Cable and a MIDI Player]
You can translate the page to English using
Google Translator.