Re: Interesting/Dumb Questions
To answer your questions, Jake:
1) The surgery thing, to my knowledge is not possible. If it were possible, then they would have plenty of patients out there with working larynxes (sp?) instead of using those robot sounding things that they have to use to talk. (I forget what the devices are called.) Anyway, the hard part about getting it to work is first of all, having your body accept the foreign larynx, then getting everything innervated correctly. And just because they stick someone else's larynx in your body doesn't mean that you're going to know how to coordinate everything like that person did. They'd have to give you that person's brain too in order to make it somewhat effective because most of the coordination that he person has learned is actually in the cerebellum of the brain.
Anyway, assuming this could work, I don't know the degree to which it would change your tone. Your unique vocal timbre comes from the unique shape and length of your vocal tract, not from the shape of your face. The length and thickness of your vocal folds will also influence timbre. Longer, thicker cords give richer, fuller sounds.
2) Facial surgery wouldn't alter your tone much at all. Surgery to change the shape or length of your pharynx WOULD significantly alter your tone. Even surgery to change the buccal cavity (mouth) would alter your tone. So if you have oversized tonsils, for instance, and have them removed, your vocal quality may alter somewhat since they're part of the vocal tract.
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We have eyes, but cannot see; ears, but cannot hear.