Every note in a grand piano has more than 35 points of adjustment. Regulation is the adjustment of the mechanical aspects of the piano to compensate for the effects of wear, the compacting and settling of cloth, felt and buckskin, as well as dimensional changes in wood and wool parts due to changes in humidity. While tuning corrects the pitch of your piano, it is only one component of a complete maintenance program. Regulation attends to the touch and uniform responsiveness of your action, all vital to making each performance pleasurable. In addition, regulation ensures that your instrument is capable of producing a wide dynamic range - a critical factor, particularly in pianissimo passages.
Music is one of the most complex vehicles for expression.
Its beauty is reliant upon personal interpretation which employs use of changes in dynamics and tempi. These changes require extremely fine adjustments to respond to the pianists nuances and subtle shadings. A smooth, even response throughout the entire range of the keyboard and an extremely quick action capable of playing rapid passages and repeated notes evenly is essential. Outstanding response is essential for a pianist to create an outstanding performance. No amount of practice can compensate for a poorly maintained action.