Sound, sound, sound!
Obviously, just getting sound to work wasn't that hard.
I included the Intel 8x0 driver in the kernel and I was set.

Stereo-sound worked perfectly.
Even when I plugged the 3x3.5mm stereo -> 6 RCA and plugged it into my receiver, it worked.

However, it seems as if mplayer doesn't support that setup.
Does anyone have any input on this?
I'm reluctant to using the SPDIF since it's so stupidly located on the front of the DiGiMatrix.