>>I know how I can turn the UT message alert on and off, but I want to change the actual sound which I hear. Now I hear a short "Goodbye" message, probalbly a WAV file is being played. I have all the options in Sounds unchecked, so I don't know where to search. And I have a lot of WAV files on my computer, I don't want to browse through all of them to find which is "in action".
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>The site doesn't send a Goodbye sound. Can you tell me where exactly you have that?

For instance when you replied to me, a short Goodbye was sounded through my speakers. I am pretty sure that this is a Windows settting, but I have no idea which setting it is, since I have all Windows program event sounds set to None.