If your piano feels inconsistent from register to register or is difficult to play, you might need a regulation.
Over time, the wood and felt parts of your piano wear down, making the action feel heavy, uneven, and unresponsive. Dust and dirt also collect in many places that cause action parts to move sluggishly. Regulation is the process of taking the action out of the piano, removing all dirt and debris, repairing/replacing all broken parts, and then finally aligning, lubricating, and regulating each part in order to provide the greatest amount of sensitivity and ease for the player. The diagram below illustrates a cross-section of a single key on a grand piano action. There are roughly 20 adjustments to be made to each key. Multiply that by 88 and you have a fully regulated piano. We recommend having your piano regulated every five to ten years.