How to get surround sound on Astro a40s

[ScrubLordP]

Hey,
Im using Windows 8.1 with an ASRock fatality motherboard. I just built my first PC and i cant seem to be able to figure out how to get surround sound on my Astro a40s. I know it's possible because on my previous computer (which was just a laptop) i was able to get surround sound. It may have not been 5.1 but there was at least surround sound. I've tried searching in Realtek, but I just cant seem to figure out how to get surround sound.

Any help is appreciated!

 

[1337mode]

according to one of their "gaming experts" (mountain dew and Doritos worshipers) its only stereo sorry buddy

 

[1337mode]

update:
you can if you use an optical cable and your computer supports dolby digital live