I have a Latitude D630. I know how to use the audio controls through the control panel. However, there is a default beep that occurs under certain circumstances. It does not seem to be possible to control the volume of this beep. It is some kind of primitive warning that occurs under infrequent conditions. One such condition is when I am using applications through the internet and I create some sort of error condition. It happens so infrequently that I can't quite figure out the pattern of when