Question about my Motorola Droid Volume Rocker. Pls Help?

I somehow altered the settings on my droid so that the toggle that silence's the phone when i receive a notification is disabled. I cant figure out how i did it, & i would love to change it back! What i mean is that when i get a notification i cannot use the the volume rocker on the side of the phone to quickly mute it like i use to be able to. Does ANYONE know the setting i need to go to in order to chaange it back? :/
 
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