I went to the support page for your camera and looked for the manual (it's about 1/3 of the way down the page)
http://support.nikontech.com/app/ans...ail/a_id/13948
The only sounds settings I see are on page 97. You have only have 3 settings though! 1 through 3. Maybe it's on 1, and you can increase it to 3. On page 98 it talks about sound release, but I don't even know what that is.