How To Turn The Sound Off When Using The Key Pad On My Straight Talk Zte Savvy?

My zte savvy never use to have sound effects when using the key board. But the other day i put the phone in my pocket without tutning the screen off and must have accidentally tutned on this feature. I have tried going into system settings under sound and made sure the dial pad sound was unchecked but this didnt fix the problem. I also tried restarting the phone and tsking out the battery but that hasnt worked either. Im out of ideas, please help.