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Voicing is an extremely difficult area. It's subjective in the extreme, and has caused endless discussion in piano maintenance circles. But the final goal of voicing is to have the hammers striking the notes of the piano to offer a uniform sound from the bottom to the top of the instrument. Goes without saying that evaluating this capability is governed by the capability of the piano, and the construction of the action parts. But, often a technician will find extremes in voicing, such as a particularly hard hammer, which may result in a note sounding louder than the rest. But, this too can be laid at the door of regulation. This is where the tuner's skill comes into play here. Voicing can be accomplished by pricking the hammer with a set of needles. This pricking changes the structure of the felt, and softens the hammer to a degree.
What is toning?
What is "toning" This is the reverse of voicing, and accomplishes the inverse sort of thing. May be necessary to bring up a particularly soft sounding hammer, and bring it into line with its neighbours. This is accomplished by applying a special material to the hammers or ironing with a special tool.
Robin Foster MABPT
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