Group policy for accessing sound settings

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http://serverfault.com – On a customer site, a "normal" (i.e. non-administrative) user cannot access the sound settings (mmsys.cpl) of the computer, whereas an admin can. From the error message the user receives, my impression was that a group policy causes the problem. Do you know which group policy can do so (the customer's admins do not know that...)? (HowTos)