Anyone ever tried it or know how it's done ?
I remember reading as a kid that some of it had to do with misdirection. The ventriloquist looks at something which is supposed to be speaking, and therefore we're "clued in" as the audience as to "where" the voice is supposed to be coming from. Also, even an untrained person like me can say some words without having to move my lips, or at least without having to move them very much. In the case of other words, though, ....it's not happening for me. In fact, someone doing a poor job of ventriloquism is kind of funny in terms of how bad it looks.
Does it relate at all to skills used in "throat singing" like the Tuvan engage in ?
( Interesting side note - the Inuit method of throat singing is supposed to be quite different than the Tuvan, and is mostly done by women. )