Piano feel uneven or not quite right?

Over time a pianos touch can become uneven, heavy, or difficult to control and require servicing. The precisely regulated parts of a piano action begin to fall out of sync and can make the keys and action feel spongy and sluggish. Adjusting the action and dampers of a piano, called regulation, is the process of achieving an even touch throughout the entire piano. This is important for all pianos but essential for piano students and music teachers, since practicing and/or teaching on a piano that is uneven can be very counterproductive for technique. Servicing a piano will give greater satisfaction on the instrument and can vastly improve the technique and virtuosity of pianists.