I don't have any experience with virtual surround, but I do have a potential alternative if you don't get it figured out.
If the games you play have a headphone mode, try it. That typically gets a pretty good virtual surround effect. As for improving sound quality, check out the AutoEQ project on GitHub. I got some cheap $20 Monoprice headphones that sound like they're $150 or better when using the correct profile from AutoEQ.
386SX 33mhz overclocked to 40mhz 4mb ram 650mb hd Cirrus Logic VGA card Windows 3.1 No sound card or modem.
In 1998.