checking things
You can assume that udev will autodetect your sound properly. You can check this with the command:
lsmod | grep '^snd' | column -t
If the output looks similar, your sound drivers have been successfully autodetected.
You might also want to check the directory /dev/snd/ for the right device files:
ls -l /dev/snd
If you have at least the devices controlC0 and pcmC0D0p or similar, then your sound modules have been detected and loaded properly.