Wiring

Here you can find the user guide 
http://www.epox.com/usa/download.asp?link=2Rq22Q2N3o2ta30Ab00C0z0bv0V22sq21j0wB10ca33o3m0W0EF1O3r00d1A0Iq30m1dZ03O0r1fH0B0E1B1s00Rd03r0Ct01aG00U1CR3c00H3LD02n1D1b2v2h2R2pN3a00u0J&function=download&id=1368

these must be a picture of the motherboard with the connectors tagged into it.
I think the audio one is in the bottom right corner of the motherboard.
The audio connector of the chassis probably has a false pin so that you can't plug it wrong(but if the chassis has a connector that looks like a bunch of loose cables, you need to carefully read where each one goes, I'm sure the manual says it clearly)