Well it is a start! I definitely have thought about adding extra padding for the downward noise, but it is the upward clanking that is ticking me off XD I'm fairly certain it is exactly what i said it is, some of the highest and lowest notes don't have the upward noise. I assume this is because i have not been bashing them. So, it seems a reasonable assumption to think the white plastic keys are slipping off of the hammer mechanism. In fact if i wiggle the keys, the loud keys are more loose than the others. I once took a Casio apart which had a broken key, and i found that the keys had a plastic type of frame that sort of sat around the actual metal mechanism and some of these plastic pieces were warped. That might have been the PX330, but i don't remember too well. Either way, what a bummer. Maybe i can just glue the white plastic bits in place? Even then, a little more abuse will undo that effort XD