Is there a keyboard shortcut to mute my speakers?

[hisno1girl]

The speakers are in my monitor, not separate.

I don't have a keyboard with the special buttons.

I like having music playing but I don't think it's professional to have it in the background when a client calls and my phone is right near my monitor.

It's not loud enough to be heard out of my office.

[WOT?*]

Do you have an icon on the lower right of your screen that you can click on?

Otherwise you need to set up/download a hotkey, I believe. Here's a very simple way explained in a blog entry. Can you download to your computer or is the system blocked?
dan.hersam.com/2010/05/06/mute-and-adjust-volume-with-keyboard-hotkeys/