Did you see this:
http://www.antec-inc.com/support_rod...ber=5&FAQno=15
I would guess that (from the manual of my A7N8X-X) that
Mobo name on left, case name on right
AGND goes to audio ground
+5VA goes to not connected?
Mic2 goes to MIC BIAS
Mic Pwr goes to MIC POWER
Line_out_R goes to FPOUT-R
Line_out_L goes to FPOUT-L
BLine_out_R goes to RET-R
BLine_out_L goes to RET-L
NC not connected
Try wiring it like that and see if it "goes"
//edit: added my best guesses