Jean-Francois The top resonance as with the back and the internal resonance of the box will vary as the build continues. Any change of the stiffness or weight of the top or back will shift their resonance peaks and this will slightly affect the internal resonance. Lots of great references on the web, google fft analysis of acoustic guitars or similar wording and there is enough to keep you busy for way too long.
In case you are interested the 1st side of the Blackwood Baritone in in my bender right now.
Fred
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