gistfile1.js

var s = document.createElement('script');

s.setAttribute(
  'src',
  'https://youpy.github.io/Hoover.js/example/hoover.min.js'
);

s.addEventListener('load', function() {
  var hoover = new Hoover(new AudioContext());
  var interval = 200;

  hoover.connect(hoover.context.destination);
  hoover.start();

  setInterval(
    function() {
      interval = 100 + Math.random() * 400;

      hoover.frequency.setTargetAtTime(
        100 + Math.random() * 400,
        hoover.context.currentTime,
        interval / 1000
      );
    },
    interval + 100
  );
});

document.body.appendChild(s);