Okay, after reading up a little, it seems the labels on the motherboard are for Intel High Def Audio, and a manual I managed to find for another Intel model gave an "AC97" equivelent, which was very helpful.
Try this setup.
1 MIC IN
2 GND
3 MIC_BIAS
4 GND
5 R-OUT
6 R-IN
7
8 KEY
9 L-OUT
10 L-IN