hi i have a Yamaha RM1X with some bad buttons, i thought i could try to clean them up with some special spray or likesuchas but they look rather "sealed", it would probably be better to change all of them, can anybody point me to right direction to get some replacement? They hace a "gummy" top and a black body and a silent/soft feeling or maybe a "soft/silent/clicky" feeling as they click but with a padded feedback the picture is quite bad but i only have a web camera at the moment.. thanks