I have been searching for some time for this component in the photo. A sensor used in otomatones.
I never had the opportunity to open up one and have no idea what they are called how they work and how to search for a similar sensor(is it a button array?).
To poorly describe its use - it tracks the position of the place it was last touched and a note corresponding to that position is played.
I remember that it had a great feel to the hand when I played a friend's otomatone. Any info would be greatly appreciated.