The beta 4 install went almost perfectly, however when I got to the end of the setup it was claiming it could not find a soundcard. However, when I restarted my PC, the correct Alsa drivers were loaded and sound worked. I have an es1370.
On the subject of alsa drivers, I have noticed that the sound in Return to Castle Wolfenstien single player occasionally skips during the animations, and doesn't seem to work at all during the intro. Switching to the OSS drivers for my sound card cleared this up. (I also disable arts before starting the game) I have also noticed that /usr/bin/artswrapper is not installed suid, so arts complains it can't run with real-time priority. Is this intentional?