Help i have no sound in game

I have an iPad 2 but not one of the game apps in which I have purchased have sound. I just got a new game for little one and she keeps asking why are they not talking? Is there something I might have done to deactivate the sound. Please help

 

volume buttons are on the top right side of the iPad.

also you can double click the home button and on the part that pops up on the bottom of the screen, scroll all the way to the left and make sure the volume is not muted.

 

Thanks was on mute. This forum rocks