[shmeeed]

Is it really possible that there's no driver that is capable of doing this in Windows? Did you look into this?

I wouldn't know because I consider all those effect libraries, mixers and presets ("Concert Hall" - who would ever want that?) that usually come with the audio chipset driver suite as bloatware and try to get rid of them, or at least never touch them - but it would surprise me if there weren't anything that affects the amount of stereo separation...?

[shiroiushi]

I haven't looked into it, no (and certainly not on Windows!). It wouldn't surprise me at all if there's already readily available software that does exactly this. Even my phone has a bunch of options for altering the sound, including something called "DTS:X 3D Surround".