Wrong tuning or intonation

It happened that most likely voicing was performed, obscuring the sound oop. It was performed with improper voicing. There must be a proportion between the hardness of the crown and the hammer shoulders, otherwise the sound becomes dull and no longer has "dynamic range" between piano and forte. Send me, if you want, a WhatsApp audio to the number 3393395980 with photos of the hammers. What model is it? Upright? Grand?

One must try not to alter the voicing intended by the Manufacturer too much. The hammer felt should not be shaved. When the grooves are too deep, the hammer felt must be replaced. If there are very hard and pronounced grooves, one can intervene gently at the end of each groove, without going deep and listening to samples in every area. Voicing is a delicate and irreversible intervention. Excessive "softening" (and not "voicing," which takes other things into account!) can compromise the hammer felt forever.

It is not certain that this is your case, but one must always evaluate what stage of life the hammers are in and evaluate what to do (even nothing or very little). In fact, when the hammer felt (but I don't know if it's your case) has very deep grooves and/or is even flattened on the crown, it is not appropriate to intervene, thinking, against all good sense, that one can "round it off," making the grooves disappear or improperly using the voicing tool to soften the crown. Both of these unsound interventions worsen the sound, immediately or after a short time. Excessive shaving, moreover with a disastrously "rounded" shape, also involves the alteration of the "geometry" of the action (alteration of distances and specifications dictated by the Manufacturer) and, most importantly, of the correct "strike point" on the strings. The latter, especially in the "cantabile" area and the high notes, is of fundamental importance.

Everything needs to be seen and verified

I await your images if you wish

If you can, post them also on the Forum (sometimes I am unable to open them) (but perhaps for other members they may be useful and interesting)

P.S. Sometimes a precise tuning is sufficient before voicing. Uneven voicing and a poor level of unisons and octaves can generate an unpleasant sound. Sometimes people think of "covering" or "masking" these inaccuracies with a "softening" of the sound. Nothing is more contrary to good sense.

Let me know

Paolo Ferrarelli