Valid sound card names (comma separated):
pcspk       PC speaker
sb16        Creative Sound Blaster 16
cs4231a     CS4231A
adlib       Yamaha YM3812 (OPL2)
gus         Gravis Ultrasound GF1
ac97        Intel 82801AA AC97 Audio
es1370      ENSONIQ AudioPCI ES1370

-soundhw all will enable all of the above