Hebrew Pronunciation in Rituals
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Israel Regardie put out some tapes a while back to correspond with the "Complete System of the Golden Dawn". This has many examples of rituals, glossary terms, and goes through the Hebrew Alphabet - from the perspective of the Golden Dawn. As I understand, he was tutored in Hebrew when in his teens or early twenties. In the tapes he is a stickler for what he feels different God Names and phrases should be pronounced like. Take a look around and see if you can find for purchase - I have some that were given by a friend...
I would also reiterate that this is all overriden if you are working in a system that has its own methods.