What is voicing?

If your voice cracks it sounds awful, right.  Well your piano can fall prone to the same change of tone.  The hammer of the piano action is what strikes the strings; the felt cloth is wrapped around each hammer and it gets hard over time.  On the other hand the opposite can happen the felt on the hammer can become too soft and muffle the note.  Voicing is the rehabilitation of the hammer felt to produce a beautiful resonant tone.