Audio cannot travel through the air as radio on its own — it is the wrong shape and the wrong size. Everything about broadcasting follows from what has to be done to it before it can leave the building.
A microphone produces a signal that swings a few thousand times a second at most. Radio waves that travel usefully through the air oscillate hundreds of thousands or millions of times a second. Those are not the same kind of thing, and audio cannot simply be radiated as it is.
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