I've checked through the main menu and I cannot find a way to mute the keyboard sounds they are terribly annoying !
Option 01 - Go to home screen -then settings - next Language & input - afterwards click on right side changing settings small icon next to Android Keyboard Settings then remove the tick from Sound on key press.
Option 02 - Open your keypad and press on the setting key (Bottom of the Left side of your keyboard next to numerous key) then select your keyboard from input option (Android Keyboard Settings (AOSP)) and remove the tick on Sound on key press. That's all!!
Hope this might help!!
i need an answer for this question too
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