Voicing represents the time honored means of changing the tonal character of a piano.  Quite often over a period of months or years, regular playing results in a more brilliant and sometimes even strident sound.  It results from the hardening of the hammer at its crown, the point where it contacts the strings.  The other
situation is where the tone is too weak though this is much less common.

The remedy with the tone too strident is the filing of piano hammers with the proper grade of sandpaper (which will effectively remove the grooves from the felt surface) followed by “tenderizing” these hammers with needles.  The goal is to achieve a mellower sound consistent throughout the scale.  In the other but much less common situation with the tone being too weak a variety of means can be employed... a light filing using very soft grade sandpaper, pounding the hammer crown with the butt of a screwdriver, ironing the felt, and most radically the application of a hardening agent (referred to as “doping the hammers”).   But with the former case involving hammers that are too shrill sounding, a few years ago I discovered what I consider a more effective means of voicing which was demonstrated to me by a close colleague.  It entails doing the voicing by means of a powerful motor which has attached to it a cylindrical shaped tube with at least one needle projecting from the end.  The chief advantage is in it being much less labor intensive than the traditional "stabbing" technique and it achieves the same necessary penetration into the hammer felts.   And it is certainly more "tuner friendly" since the effortless, minimal force needed certainly doesn't exact a toll on the tuner's arm!
Voicing which I would consider as "tenderizing the hammers"

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