I am not a musician. My spouse plays a Roland HP 230 she has owned since new that I did a repair on. I hope this information is helpful.

A few months ago the instrument began playing first one then two notes too loud. I found that the two afflicted keys, when depressed, produced an almost inaudible click not heard from other keys. With the cabinet open and the keys off, I found I could reproduce this click by depressing the contact pad for either of these two keys. The click occurred when the distal contact inverted. Then, when the keypad was depressed with power on, the sound produced was the loud sound of the misplaying key. Apparently, when only the proximate contact makes the piano's computer plays the sound as loud as possible. These inverted contacts would go back to normal if left alone overnight. I also found that new keypads from the Roland National Service Center are no longer available. This, by the way, I proclaim, is an unforgivable lack of support.

A service center person I spoke to in Salina, Kansas suggested swapping the bad pads to the end of the keyboard. However, I wondered if something placed into the well of the keypad would prevent the contact from inverting. A BB is a perfect fit but too tall. So, I ground off one side of two and dropped them into the contact wells, flat side up, where the contacts were inverting. Reassembled, the piano plays as new. However, I fear objects in the contact well will eventually wear out the silicon rubber. Well, the contact pad was already shot.