I tried out sForzando, latest version, with the Heaven GM fonts; couldn't get it to work properly. Same with Sampletank, and the Omnisynth GM set, bought versions. Too much hassles to get going.

XGlite works quite well, though you'll need the installation PAT file from Mike to adress the sounds via BIABs dropdown track menus. Best alternative IMO is the free Halion Sonic SE 3, or the older Hypersonic2 from Steinberg. (The latter is licensed, alas not available anymore, but as it's outdated as such one might consider an illegal version LoL or buy it on eBay) - F