Software for sound analysis is easy to come by and use these days. I've used some old shareware and freeware for years; so old that it won't run on 'modern' operating systems. A friend wrote a nice free app for Android devices called 'Luthier Lab' that has a useful spectrum analysis module, as well as a signal generator that can be used to help find resonances by driving them. You'll need some sort of amplifier for that, of course.
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