Topic: Trembling of the malleus
It is interesting, how many vibrations of the hammer itself are synthesized in the reproduction of sound? After all, the vibration of the hammer is what is the next tool of expressiveness of the instrument. If there are vibrations, most likely there are harmonics. These vibrations make a blow on the string that is biting then softened. It depends on the phases of the hammer-string state. The impact point is likely to change slightly. These are subtleties, but they have a place to be for professional pianists. A "condition" slider might add hammer-hammering on the axis.
Picture from
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