Editing my own post:
Errrhhh ... Sorry. I didn't see that you had edited your post. I read it earlier, at work and only replied to that. I now must edit my own post.
No, you don't need to copy anything to /etc/modules.conf
Just run alsaconf (as root, see below) from a command prompt. If this doesn't work, then try this:
End of edit
I apologize for not being able to give more precise instructions than these. It's kind of difficult, since I don't use Mandrake myself.
The first thing I think you should try is the Mandrake configuration program. From the Mandrake Control Center, try "Hardware" and see if you in any way can configure it from there. This would be the safe and easy way of doing it.
This is the more experimental way:
You know about the 'su' command to get root (super user) access in a terminal window, don't you? For this test to work, you need to be root. Therefore open a terminal window and type
(note the minus, it's part of the command).
After entering the root password, you are now root with supreme powers of the system.
Try inserting the kernel module (driver) manually! Issue this command (in part stolen from the page I linked to earlier):
modprobe snd-card-cs4232 snd_index=0 snd_port=0x534 snd_cport=0x538 snd_isapnp=0 snd_dma1=0 snd_dma2=1 snd_irq=7
If you get an error: "Module snd_card_cs4232 not found." then try again but leave out the 'card' in the command, like this:
modprobe snd-cs4232 snd_index=0 snd_port=0x534 snd_cport=0x538 snd_isapnp=0 snd_dma1=0 snd_dma2=1 snd_irq=7
Did any of these commands work? Did you get sound? If you only got an error message, please post it here. If it works, then we can arrange for this to load automatically on boot.
Again, my apologies for not being more precise than this.