[sdiy] what exacly is "audio" in electronics terms?

[Glue Sniff]

what exactly is flowing through those wires and patch
cords as, "audio" ? I have built many synths and
effects pedals through the years,  but I am still in
the dark about this most basic of questions. is it,  
amperage, voltage, resistance?  in the case of a sine
wave what is it that is rising and falling?    

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