I made a primitive Theramin out of Popular Electronics or somewhere when I was in high school- didn't know it used heterodyning though. Have only thought of it used to lower radio frequencies to audible one. I couldn't figure out how the subharmonics formed from the strings, but that makes sense.
something else about violins- they have a bass bar inside the top plate on the side of the lower pitched strings, to accentuate the lower notes, and the sound post on the other side emphasizes the higher frequencies. Little two-way system in there.
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