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I had the same issue earlier, but it has nothing to do with Xoops.
Put on some music in the background and visit a random site where you have to scroll a bit, if you get the screechy noice then too then it may have something to do with your soundcard or the installation of it, I think.
If the sound is back to normal when you restart your computer and try the scrolling again you shouldn't worry to much about it. Besides ..musiceffects like screeching is cool too
Best Regards,
Bananadude
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