Tone regulating is the fine art of adjusting the tone quality of a piano so that each note has the desired amount of brilliance or mellowness. If a mellow sound is desired from a brighter piano, careful needling of the felt cushion behind the striking point of hammer is done. This is due to the fact that a soft contact point yields a warm/mellow sound. In the event a pianist prefers a brighter sound from a mellow sounding piano; compacting the hammer felt through a chemical and or physical process is performed, as a hard contact patch yields a brilliant/crisp sound.
In addition, it must be known that all pianos get brighter sounding over time as a result of usage. As the hammer strike the string, the felt compacts and hardens. So, every so often a piano should be voiced to prevent a overly bright, ear piercing tone.
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