I've heard that a keyboard with poor quality sound can be reprogrammed with a library of better quality MIDI sounds. Is this possible with all keyboards? If not, what determines whether a keyboard can be reprogrammed or not? If if there's a general method, how do you do it?
For example, I'm looking into a Williams Etude, but the reviews say that the sound quality is cheap. I'd have no qualms about reprogramming it if it's possible.