I found a nice little utility to mute computer speakers at the following site:

http://magic.aladdin.cs.cmu.edu/2005/08/01/command-line-mute/

It is now very easy for me to mute/un-mute my speakers since I have this setup with SlickRun. Basically, while working on my computer I hit ctrl+space start to type mute and hit enter. I now have toggled the sound on/off on my computer speakers. Great Little Program!