Hello so I'm in need of on a new headset and I narrowed my choices down and found the ones I want. The headset will be http://www.amazon.com/Sennheiser-360...ef=pd_sim_vg_3, Now I have a question since I need a dedicated sound card to actually make these headset worth it dose the Astro mix amp work like a sound card? I have not a clue how audio works or should I just buy audio card. If so can you recommend me one that would be nice.