could someone help me plug in my front panel audio?

i have an EagleTech dragon case (ET-CADG-BK). the front panel audio connecters are labeled: MIC, MIC BIAS, RET-R, RET-L, FPOUT-R, FPOUT-L, and AUD GND

my motherboard is an Asus P5N-E SLI. it can be set (in the bios) to either use HD-audio or Legacy AC'97. the HD pins are labeled: GND, PRESENSE#, SENSE1_RETUR, SENSE2_RETUR, PORT1L, PORT1R, PORT2L, PORT2R, and SEBSE_SEND.
the Legacy AC'97 pins are labeled: AGND, MIC2, MICPWR, Line out_R, and Line out_L. (4 of the pins are labeled NC)

Could someone tell me which audio type to use and how to plug them in?