Sound volume problem after upgraded to Lion Mac OS X 10.7? Any help?

I have just upgrade to 10.7 Lion last night. Whenever I change the volume, no matter by pressing the volume up or down button on the keyboard, or using the mouse to change the volume on the top bar, the computer hangs for a while, with no sound, for a few seconds, the youtube video reset or hang, even the Safari hangs for a few seconds.
Anyone has the same problem? Any fix on this?

Another thread suggested this fix see screens
Removal of the following files
~/Library/Preferences/Audio/*.plist
~/Library/Preferences/com.apple.soundpref.plist
This is a possibility for a fix.
Christopher Reynolds, ASQ CRE, PMP, BS IS

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