"Recognized correct" in the sense that we guess that's how ancient Hebrew speakers pronounced it, based on Arabic. But we don't really know for sure.

How do you pronounce the ayin?

(Not parent)

Basically "ah-in" or "ah-yin" ("ah" being pronounced like when a doctor tells you "open your mouth and say ah"). It makes the use of that letter much closer to "a" (א or ה in Hebrew).

We don't really involve the deep part of the throat, though I think it's pretty well known that you're "supposed to".

very close to א and ה... They all sound like Ah/I/Uh/Eh depending on the punctuation