const sounds = (function(){
  let sounds = {}
  let els = {}
  sounds.add = (fn) => {
    const el = document.createElement('audio')
    el.src = 'sounds/' + fn + '.mp3'
    els[fn] = el
  }
  sounds.play = (fn) => {
    const el = els[fn]
    el.currentTime = 0
    el.volume = 0.8
    el.play()
  }
  sounds.add('click')
  return sounds
})()