NOTE: In FC3 if you do not have the "pcspkr" kernel module loaded you will not actually hear the bell and of course you can adjust the volume and pitch with the "xset" command. Is this the bell you are referring to?
There is also a command called "xkbbell" that will send a beep. If you are doing it from a gnome-terminal, make sure you have the bell enabled (there is a checkbox for it in the gnome-terminal settings menu).