So: 

cmpci0 at pci0 dev 6 function 0: C-Media Electronics CMI8738/C3DX PCI Audio 
Device (rev. 0x10)
cmpci0: interrupting at irq 3
audio0 at cmpci0: full duplex, mmap, independent
opl at cmpci0 not configured
mpu at cmpci0 not configured 

Which is able to play CDs, but not other audio. 

Will commenting out the audio device entries and letting COMPAT_OSSAUDIO do 
its stuff work? I tried setting opl0 and mpu0 manually in the kernel config 
file and that didn't help. 

Is there any way to get the mixer on this card to work? 

TIA