you're gonn ahave to explain it better than that... you want to replace some audio in a song? - well then you either imnport somer audio and place it on a track or record some audio - The Pool is simply a list of audio clips/parts which may or may not be actualy used in the track (you can import audio to the pool, or record audio which goes into the pool, but that doesn't mean that audio has to be actuly used in the track)
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I had an idea for a script once. It's basically Jaws except when the guys in the boat are going after Jaws, they look around and there's an even bigger Jaws. The guys have to team up with Jaws to get Bigger Jaws.... I call it... Big Jaws!!!