Go here to check it out:
OSSC Audio Upgrade Boards Available
I have 3 of these boards available for the 1.5 OSSC, $25. Head over here to purchase.
9 and 10 pin mini din connector assembly
I recently got some 9 pin mini din connectors from console5.com of the new slim variety. However, it was not intuitive at first how they went together. I figured it out, so here is a short tutorial.
Edit: I got this a little wrong and will redo the tutorial soon, in the meantime here is the guide from Console5.com.
Tinkerplunk 