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Make it sound like a crying baby with a struggle cry every so often and mix it up. Also dont just rely on a rabbit call especialy if their are not any rabbits in the area. Get more than one caller. Get the book called, The ultimate guide to blackbear hunting. Most of your questions will be answered in that book.
Start soft and work up from there. If you start by blowing as hard as you can you could send anything close into the next county.
Just as a little warning. Calling bear isn’t for everyone. They often come in hard. If you don’t have your %/=$ together, lol. You might need new shorts. To me it’s like coating yourself in moose in heat cow pee, you don’t always get what you wanted out of it. Just a heads up. The experience can be quite exhilarating. Calling bears that is, not the moose pee.