I remember that some years ago a high profile violin maker claimed in a Strad article that putting a 1g weight in a certain spot in the violin would bring out the desired over all sound quality. As far as I remember it was about getting the 'sizzle' in the sound. Of course he didn't say where this spot is.
Maestronetters are more open about their sound experiments. @Don Noon conducted an interesting experiment where he cut away the upper right f-wing with the result that the overall loudness improved but sound quality decreased .
Sam Zygmontovitch made in his Strad 3D film as well some comments on the area between lower f points and the c bout rim.
Last not least I remember having read an article which focused on the importance of the thickness around the f holes. It is known that if the area below the treble side f hole is too thin a wolf note can come out.
So how important is the region around the f holes for the sound quality and loudness?
Opinions?
Experiences?