All pianos need to have a complete regulation at least once every five years. This sets the distances in the action back to factory spec. Please go to the YouTube tab and watch the video for grand piano regulation. There are many steps to a grand piano regulation hence its cost can get to be around $750.00 but the end result is that the piano “feels” right and should have high repetition capability. A poorly regulated piano is a frustrating experience and young ones can get easily discouraged as the keys can become too hard to push down. Notice the picture of a well regulated grand action. An even hammer line and newly filed hammers are immediately noticeable.