SERIOUS QUESTION

Actually, it's a silly question, but I'm serious in my desire to know the answer. It kept me up for awhile last night.

RE: those voice box thingies that people who've had tracheotomies use to talk - what would happen if someone without a tracheotomy were to use one while talking? Would it be like a megaphone, making the speaker's voice really loud, or would it sound the same?

I have no idea how they work but suspect that they amplify some sort of vibration in the throat that occurs with or without the use of voice, and therefore it would sound the same, except with the speaker's voice being audible as well.

TIA!