sS hjs_playHum() {
  ret hjs(replaceDollarVars([[
    var humSound = new Audio($url);
    var humSoundCanPlay = false, humSoundPlaying = false;
    humSound.loop = true;
    
    humSound.oncanplaythrough = function() {
      humSoundCanPlay = true;
    };
    
    // start playing and/or change volume
    function hum(volume) {
      humSound.volume = volume;
      if (humSoundPlaying) return;
      humSoundPlaying = true;
      humSound.play();
    }
    
    function stopHum() {
      if (!humSoundPlaying) return;
      humSoundPlaying = false;
      humSound.stop();
    }
  ]], url := jsQuote(dataSnippetLink(#1400406))));
}