It might be so. If you don't hear enhanced audio, like in the video below, then it doesn't work.
It will work in 2.06, regardless of your audio solution. Note that not many missions have EFX set up. You can open PK4 packages with programs like 7-Zip, if you see a folder named "efxs", then it supports enhanced audio.
It seems to be working fine because, when playing your video, the sound is awesome, with reverb,echo, and ambient sounds crisp and fully textured. So I'm sure I'm getting the best audio I can. Thank you for your time.
I "may" try 2.06 sooner than later anyway, as the problem of not being able to pick up some loot items makes gameplay frustrating, and I'm assuming the fix for that will be incorporated into 2.06