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Originally Posted by JayUtah
Keep in mind that what you hear in the recording is not what the astronauts hear in their suits. True, the speakers did stop speaking when they detected they were colliding with a statement from the other party. But that collision didn't occur at the same point in the astronaut's perception as it did on the recorder.
I'm on earth and you're on the moon. I say "Hi". 1.3 seconds later you hear it and immediately say "Hi" back. 1.3 seconds later I hear it. The recorder records me saying "Hi" and then 2.6 seconds later records you saying "Hi". But from your point of view it sounds like a normal conversation. You heard me speak and you heard yourself immediately answer.
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On some of the audio recordings you can hear an echo of the ground control communications behind the astronauts' words. The Earth-based recorders recorded the ground control speaker's words as they were uttered, then the signal travelled 1.3 seconds to the Moon, where it was piped into the astronaut's helmet and picked up again (faintly) by his microphone. The astronaut would then reply to what he heard and both the echoed message and the reply travelled the 1.3 seconds back to Earth to be recorded onto the same tape again.