I got the beta a few days ago, and it wasn't working. It would freeze at the splash screen and barely make it to the menu if i pressed alt-tab or ctrl-alt-delete. it was totally unplayable. So I went through and started deleting unneccesary things, and it still didn't work. So i went into bios and totally disabled the Sound driver thats on the AI series ASUS A8V 'deluxe' motherboard and it worked farely perfectly. after starting a few new games, it's for sure working (though veery laggy as a game progresses). So i haven't heard any of the sounds, music ect. of the betas 
I wanted to bring this to the attention of the Developers and anyone else having a similar problem. Help would be appreciated.