It's a complicated matter. It could be the bracing. It could be the thickness of the top. It could be an x brace. It could be a tone bar. It could be a back brace. You have less than a 50/50 chance of making it sound better. Some luthiers will "voice" a guitar by expertly sanding the bracing after the guitar was built. You'll be learning on your guitar. And, most don't become an expert with their first DIY project. Good luck!
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"Lift your head and smile at trouble. You'll find happiness someday."
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