Reading by Ear Was Born on the Landline - The Sounder Story Long before headsets and sidetones, American telegraph operators read Morse from the click of a brass lever. The sounder turned code into rhythm - and created the listening skill radio still uses. How a sounder speaks The lever snaps down with a click when the circuit closes and clacks up when it opens. A dot is a click quickly followed by a clack; a dash leaves a longer silence between them. Operators read the silences as much as the sounds. Why it mattered Reading by sound freed operators from paper tape and let them copy at full speed while writing. Recognising a sender's 'fist' - their personal rhythm - also became the wire's first caller ID. Translate any text to Morse code, play it as sound and download the audio free at: https://morsecodeworks.com/