It's all very confusing!
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www.tuaw.com/2012/09/13/ ··· out-doe/»
reviews.cnet.com/8301-13 ··· he-dust/I had a professional audio interface that used analog audio pins to get audio in/out of an iPhone 3G. When I upgraded to 4S, it was rendered obsolete because the new phones only supported USB audio. What a mess!