Behind him, on the scarred table, the Undertone M4P clicked once, its amber light flickering out. Its work was done. Another listener would find it soon.
He gasped, ripping the headphones off.
He found the argument with his father. He had always remembered the anger. But the M4P let him isolate the undertone —the sub-bass frequency beneath his father’s shouting. And there it was. Not anger. Fear. A raw, trembling terror of failure. Leo wept. He had spent twenty years hating that moment. He had been listening to the wrong track. the undertone m4p