Linux Audio driver
There are no MWave Audio drivers for Linux, but you might be able to get sound by first booting into DOS, loading the DOS MWave Audio drivers, and then using loadlin to boot into Linux where you can try loading the SoundBlaster drivers. (kernel source)/Documentation/sound/oss/mwave might prove useful in doing this.
Linux Modem driver
There are no MWave Modem drivers for this chipset for Linux.