tape degradation sim (wip)

a.rb

const c = new AudioContext();
const req = new Request('https://dl.dropboxusercontent.com/u/334064/tmp/wh.mp3');
const source = c.createBufferSource();
const osc = c.createOscillator();
const gain = c.createGain();

osc.frequency.value = 0.4;
gain.gain.value = 0.0;
osc.connect(gain)
source.loop = true;

fetch(req).then((res) => {
  res.arrayBuffer().then((buffer) => {
    c.decodeAudioData(buffer, (decodedData) => {
      source.buffer = decodedData;
      source.connect(c.destination);
      gain.connect(source.playbackRate);
      osc.start(0);
      source.start(0);
    });
  });
});

const fn = () => {
  const t = (Math.random() * 0.1) + 0.05;
  gain.gain.exponentialRampToValueAtTime(3.0, c.currentTime + t);
  gain.gain.exponentialRampToValueAtTime(Math.random() * 0.02, c.currentTime + (t * 2));

  setTimeout(() => {
    fn();
  }, Math.random() * 4000);
};

fn();