Same for sustain. I think it was Darrel Braun on YT that recorded with a solid body that he progressively hacked more and more from the body to show that the amount of wood in the body had ZERO impact on sustain.
Sustain translates into '(slow)loss of energy'. To keep a string going you need to make sure it doesn't loose energy quickly. Stiffness is what counts, body mass is therefore not really relevant.
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