sleepwalker: you may have missed my point. I was referring to directionality. The reciprocation of engine pistons was my analog not for break-in but for electrons; there is no net current flow of electrons in a wire propogating a musical, or alternating current, signal.
For this reason, there can be no wire directionality because the electron field alternates as electromotive power, as push, pull, otherwise, we’d hear nothing. There’s as much force in one direction as the other, hence no net flow.