I know this is a dumb question, but I can't find any sort of volume control within KDE. In Windows, I mouseclick an icon in the system icon tray that looks like a speaker, and slide a slider, or click mute. How do I do this in KDE? Some apps and distributions start or end with a sound - what if you're working late at night and don't want to wake everyone else up?

On a related note, my HP computer has a keyboard with volume control buttons, but they don't work in Linux. Then it occurred to me that Linux probably doesn't have the foggiest idea what kind of keyboard I'm using, that it has volume control buttons, or how to interpret those strange commands from what it assumes to be an otherwise generic keyboard. I looked around KDE for some configuration utility to tell it that my keyboard has additional options, but I couldn't find anything.

All help gratefully appreciated.