AC'97 is software codec standard. Look at your motherboard or sound card and find the chip. Also are you using ALSA or OSS. You may have to install SDL and run /sbin/ldconfig -v . If you are using artsd or esd. Turn them off. Also you may need to set the output sound device in user.ini file. I don't know if you can set sound buffers for UT2003.
Headshots ain't fun without sound...
It isn't. Even with out sound. I still hear it.
BTW, you don't have to include -v (verbose) when you run /sbin/ldconfig.