Since it's ISA you should use isapnp, roughly it involves doing "pnpdump > /etc/isapnp.conf" and then uncommenting the right DMA, IRQ and IO base addresses. Then youve got to add values for sound in /etc/conf.modules like
alias sound sb
alias midi (midi module if used)
options sb io=(IO address) irq=(number) dma=(number) dma16=5 mpu_io=(IO address)
More in The Linux Sound HOWTO, chapter 4.2. Configuring ISA Plug and Play:
http://www.linuxdoc.org/HOWTO/Sound-...15.html#AEN338