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You can route audio like so many trains as they pass through the mic cable, to an old laptop with a semi-legally-obtained copy of Pro Tools, to a wav file, to an mp3 file, to an email sent to an old lover, who has married and has kids who play soccer at the park you used to cycle past on ambitious mornings.

If you're not paying attention, you might send a track to an output that does not exist, or, that leads nowhere. So the original signal is silent. But if you have already set up part of that track to go through say, a reverb effect, that reverb will continue getting a portion of the signal. so what comes through is a soft, beautified echo of something you can no longer hear.