Unlock Web Audio in iOS 9 Safari

unlock.js

var ctx = null, usingWebAudio = true;

try {
  if (typeof AudioContext !== 'undefined') {
      ctx = new AudioContext();
  } else if (typeof webkitAudioContext !== 'undefined') {
      ctx = new webkitAudioContext();
  } else {
      usingWebAudio = false;
  }
} catch(e) {
    usingWebAudio = false;
}

// context state at this time is `undefined` in iOS8 Safari
if (usingWebAudio && ctx.state === 'suspended') {
  var resume = function () {
    ctx.resume();

    setTimeout(function () {
      if (ctx.state === 'running') {
        document.body.removeEventListener('touchend', resume, false);
      }
    }, 0);
  };

  document.body.addEventListener('touchend', resume, false);
}

Another note: I've just had all these problems and it still didn't work.

The user cannot be in Silent mode. Even if regular music and videos play with audio, webkitAudio will not.

So annoying