This problem occurred to me when I flashed my Galaxy S II with Pure ICS Custom Rom and it uses Android AOKP keyboard. Everything works perfectly except for the keyboard, it has no sound. After hours of searching and tinkering I found out that by default Android stock keyboard sound setting is unchecked. So how to enable keyboard sound on Android keyboard? it’s simple follow this instruction.
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How to fix Android AOKP keyboard has no sound
Settings > Language and Keyboard > Android Keyboard > tack the option in the right most part (see image below for clearer view) > Sound on Keypress