beep when switching deskops

I've recently installed Kubuntu with KDE4. There are a couple bugs which I can live with but one thing in particular is just awful.

When I click the pager to switch desktops or when I just click an application in the taskbar which is on a different desktop an annoying tone plays (kind of like an out of tune piano).

I've tried looking for the setting to turn this off but I haven't been able to find it. Does anybody know how to turn it off?

[insert standard KDE4 response here]

From my (rather limited) experience with KDE4.0, many things that *should* be customizable are not, and that is perhaps one of them.

Solved!

Menu -> Computer -> System Settings -> Notifications

Then set the Event Source to The KDE Window Manager and there will be a list of possible sound events.

Click on the "Change to Desktop" ones and uncheck the box that says "Play a sound".