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When a piano hammer becomes compacted and grooved, a trained piano technician can reshape the hammer to restore the proper strike point and improve the tone of the piano.
When people people hire a piano technician to service their piano, they expect that the technician will leave the piano in tune. This is a perfectly reasonable expectation. However, there are situations where it is impossible for the technician to leave your piano perfectly in tune.
The quality of sound produced by a piano and the enjoyment one receives from playing it are greatly enhanced through proper voicing.
As parts in a piano wear, they no longer make proper contact with one another, compromising the action and its uniformity and predictability. To regulate a piano is to adjust all of the parts so that they operate uniformly and efficiently.