What is “tone regulation” of piano hammers all about?
Hammers are made under conditions that result in a great deal of compression inside the hammer and similar degree of tension on the outside. this tension and compression is balanced at the factory so all the hammers produce the same quality of tone. Playing over a period of time alters this balance, so some hammers begin to produce a harsh tone. Tone regulation restores the original balance so all the hammers produce the same even tone quality.
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