Debian Multimedia :: No Sound In Squeeze After Upgrading Packages?

I had a broken URL in my /etc/apt/sources.list file, apparently because the debian-multimedia.org site had some kind of server issue and they had to rebuild the site from the ground up. They must have changed their directory structure, because I began getting 404 Errors when upgrading packages. I eventually fixed the URL last week after it had been broken for three months, then I upgraded and rebooted. After that, sound stopped working, even system sounds. My speakers work, because I plugged them into another machine and they worked. I eventually discovered that the master volume was set to "mute", and so was the master volume in the alsamixer. However, even after changing it to 100% for both, sound still doesn't work. I even made sure to issue a "alsactl -store" command toeep the settings there after a reboot. I removed and reinstalled all the alsa and pulse audio packages, made sure that the emu10k1 driver was installed for my Soundblaster Audigy card, and made sure everything was unmuted. I have also tried a million other things that I've found on Google, but nothing seems to work. Any help would be greatly appreciated.