New hotkey assignments

I'm using XP Home w/IE7 and Media Edition w/IE6 on different computers. Both
have SP2. I'd like to be able to set up a global hotkey combination to
mute/unmute the systems' SigmaTel volumes, and maybe 2 more for +- level
control. Is this
possible, and does anyone know how? I Googled, but couldn't find a download
that addressed this specific application, only stuff that opened programs.
Thanks in advance.

Best, Paul