Hey guys i just recieved my Alienware x51 today. I also have an astro 5.8 mixamp that i recently bought. I've Been trying to figure out how to get surround sound out of my headset. be ware i am also connected HDMI, i don't know if that interferes with me getting audio from my mixamp. Should i just plug my PC360's into the alienware x51 Audio Jack? Is the sound board already 5.1 on the x51?