@ Wilse:
I don't know about MOS ver much, but i guess the design is nearly identical to the Classic Amiga, so i will tell you where the driver for that is, maybe it will help you find out it for MOS also. :-)
It's maybe AHI related, so:
SYS:Devs/ahi.device is the ahi.device itself...
SYS:Devs/AHI/sb128.audio could be the driver you need.
SYS:Devs/AudioModes/SB128 contains the audio modes that are available with that card.
So this info was given for a Soundblaster128 installed in a classic Amiga using AHI. Maybe you should have a look there too. But i really don't know about MOS. And where to get the MOS drivers?
Maybe some MOS people will answer to that. ;-)