Interesting experiment! Any chance you could record some simple and slow arpeggios with the different backs? That could help reduce variations in playing/performance and might make comparisons a bit easier (at least for my ears). Also, is there any way to do the fft on the finished guitar and still have the jig attached? I've been building with heavy sides in recent years and the additional weight seems to have quite an impact on various resonant frequencies. Cool work though and that's great that it's something you can study in an official setting!
Mike
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