Controling overtones in a build

[grosskate]

Hello Luthiers,

I have few questions for you regarding overtones.

Material/wood used to create guitars are sometimes more prone to overtone content (ex Mahogany vs Rosewood). But Material used aside :

1) What is causing those overtones aside from the wood used themselves ?
2) Can you control the overtone content of the guitars you make ?
3) Do you have methods to increase or keep at bay overtone content when you make an instrument ? Active or passive back ? Top bracing ?
4) If yes (3), will this influence other factors as well like : power, projection, sustain ?
5) How effective can this control be. Can you from the same marterial used go from almost NO overtones to a LOT of them?


Very curious. Thanks a lot for your time and explanations