Speaker trouble

For approximately 2 weeks I was searching for a way to turn off the PC speaker on my laptop. Everytime I shut down or rebooted while being logged in as root, the machine gave a loud beep. There was no pcspkr module loaded which I could blacklist.
The solution was easier than I could have imagined.
Use

Code:
$ alsamixer

on the command line and mute the Beep track.
That's it! You're done!

I feel stupid now.