I used a Creative USB SoundBlaster Live External soundcard before
The soundcard had a feature called CMSS® 3D2 described on the website as
"Enjoy virtual surround sound on stereo speakers/headphones"
Now I have a new pc which has integrated 5.1 soundcard from Realtek.
Is there any software able to achieve similar things? Not necessarily a plugin since I would like to use it with Spotify not only Winamp and such.