Trouble getting ancient on-board PNP soundcard to work

[Eamonn Sullivan]

I have an ancient IBM Aptiva (PII 400Mhz) that nonetheless ran Red Hat
9 without problems. Fedora Core 2 installed faultlessly, except for
sound. I used to use sndconfig, which isn't available under kernel 2.6
anymore, apparently. My modules.conf used to have the following:

alias sound-slot-0 cs4232
[...snip some post-install and pre-remove stuff...]
options sound dmabuf=1
alias synth0 op13
options op13 io=0x388
options cs4232 isapnp=1

I've discovered /etc/modprobe.conf and also discovered that
/sbin/modprobe seems
to work with cs4236 and not cs4232 (after much googling).

This is what my modprobe.conf looks like now: 

alias snd-card-0 snd-cs4236
options snd-cs4236 isapnp=1 
# this is all one line
install snd-cs4236 /sbin/modprobe --ignore-install snd-cs4236 &&
/usr/sbin/alsactl restore >/dev/null 2>&1 || :
# this is all one line
remove snd-cs4236 { /usr/sbin/alsactl store >/dev/null 2>&1 || : ; };
/sbin/modprobe -r --ignore-remove snd-cs4236

The install and remove lines are copied verbatim from a post on google
in which someone had a similar problem. This seems to convince Linux I
have a soundcard. The volume control on
Gnome functions and I see the mixer (and made sure everything's
unmuted). But no sound. Not a peep.

I must be missing something simple. Can anyone help?