You might be out of luck if you don't want to recompile the kernel. I've got a laptop which has the SiS 7012 soundcard and the only way I could get it working was by recompiling the kernel.
If you don't want to download the kernel sources, try buying a Linux Magazine they usually have the kernel sources on their coverdisk. I don't know which ones are available in Australia but over here Linux Format and PC Plus both have the sources. Also check out the disks for Mandrake 9.0 I think there might be vanilla kernel sources on one of the source disks.
When you've got the source you need to apply the ACPI patch to it, and then recompile, I enabled all of the ACPI options before recompiling, and disabled the APM functions. You will need a vanilla kernel though before you apply the patch because it doesn't work with the 2.4.18-6(?)mdk one, this had the effect of getting rid of the nice bootup screen, and breaking Super-Mount completely, but it was already half broke anyway.
Any way go
here if you want to see what I tried. Unfortunately the link I posted to a tutorial on recompiling the Mandrake Kernel is broken, as this was the best Step by Step guide I've seen heres an updated link to the tutorial:
http://icculus.org/~dolson/mdkxp/?c=ttrls/mdkkernel
follow it through and it makes things easy. Just make sure that you type a capital i in bzImage , when it tells you to do:
make dep clean bzImage && make -j3 modules
that was my mistake.
Before I had sound problems I'd never recompiled a kernel either, it really is easier than it looks.
Hope these are some help.
Cheers
Amos