Pianotech

As I follow the Piano Scope conversation, and the mention of Piano Meter in the conversation, I discovered that many tuning apps include a spectrum analysis feature. On the Piano Scope website there is a video where he demonstrates his spectrum analyzer as a tool for analyzing the partials for a more informed voicing job. In that video he shows a note in the middle of the piano that is well balanced vs the note right next to it where the fundamental is very low. There is a very obvious difference in tonality. Today's question: How would you go about voicing a hammer that has a need to bring up that P1 fundamental but does not necessarily need a boost in any of the other partials?  

Thank you for the first part of your reply, Wim. Please understand that I was not suggesting that a spectrum analyzer provides the answer when diagnosing anything. I was only observing that this guy pointed out a problem with P1, specifically, on that note and suggested voicing as the cure. 

Voicing, as I understand it, albeit simplistically, is making the hammer, or parts of the hammer, harder so that the note is louder/brighter, or making it softer so that the note is quieter/warmer. I understand that voicing in different areas of the hammer is used to affect overall tonality relative to F playing vs p playing. The possibility that voicing can possibly be so selective as to which specific partial it is attempting to correct is a new concept for me. Especially since no mention of the condition of the hammer and how hard the note is being played to produce the displayed deficiency is being taken into account. I was asking how voicing for that specific a correction could be accomplished at all. How can you correct the response of a specific partial when voicing?