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              <main>
  
  <h1>Audio player with tempo adjustment</h1>
  <p>Maintains pitch while slowing an MP3 down.<br>For beginner guitarists, like myself, to practice chord progressions at a managable pace.</p>
  
  <div class=group>
    
    <h2>Audio source (.mp3)</h2>

    <div class=url>
      <label class=url_label for=url_input><span>Address</span></label>
      <input id=url_input class=url_input type=url value="https://websemantics.uk/pens/audio-tempo-change-fixed-pitch/media/hard-days-night.mp3">
    </div>

    <p>OR</p>

    <div class=upload>
      <label class=upload_label for=upload_input><span>Upload</span></label>
      <input id=upload_input class=upload_input type=file accept="audio/*">
    </div>

  </div>
  
  <div class=group>
  
    <div class=player>
      <h3 class=player_display></h3>
      <audio class=player_audio controls>
        <track id=player-chords kind=captions srclang=en>
      </audio>
    </div>

    <div class=tempo>
      <label class=tempo_label for=tempo_input>Tempo</label>
      <input class=tempo_input id=tempo_input type=range value=0.825 min=0.5 max=1 step=0.025>
      <span class=tempo_display></span>
    </div>
    
  </div>
  
</main>


<footer class=myStuff><style>.myStuff{z-index:10;font-weight:100;color:#777;font-size:16px;position:fixed;width:100vw;left:0;bottom:0;margin:0;background-color:hsla(269,19%,20%,.9);padding:.125em;line-height:1.5;text-align:center}.myStuff_lnk,.myStuff_lnk:visited{text-decoration-skip: ink;color:hsla(211,100%,72%,1);text-decoration-color:hsla(211,100%,72%,.5);transition:all .3s ease-out;white-space:nowrap}.myStuff_lnk:focus,.myStuff_lnk:hover{color:#fff;text-decoration-color:currentcolor}</style><a class=myStuff_lnk target=linkedin title="[LinkedIn - new window]" href="https://www.linkedin.com/in/mikefoskett">Mike Foskett</a> &nbsp; <a class=myStuff_lnk target=popularpens title="[new window]" href="https://codepen.io/2kool2/pens/popular/?grid_type=list#">Popular pens</a> &nbsp; <a class=myStuff_lnk target=latestpens title="[new window]" href="https://codepen.io/2kool2/pens/public/?grid_type=list#">Latest pens</a> &nbsp; <a class=myStuff_lnk target=webSemantics title="[new window]" href="https://websemantics.uk/">webSemantics</a></footer>
            
          
!
            
              body {
  --spacing: .75rem;
  font-family: sans-serif;
  line-height: 1.5;
  text-align: center;
  margin: .75rem;
  padding-bottom: 2rem;
  color: hsl(269,19%,30%);
  background-color: hsla(32,100%,85%,.35);
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg width='100%25' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cfilter id='a'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.4'/%3E%3C/filter%3E%3C/defs%3E%3C!-- %3Cpath filter='url(%23a)' opacity='.3' d='M0 0h1200v256H0z'/%3E--%3E%3Crect filter='url(%23a)' opacity='.3' width='100%25' height='100%25'/%3E%3C/svg%3E");
}
@media (min-width: 48em) {
  body {--spacing: 1rem;}
}
body * {box-sizing: border-box;}
h1, h2, h3 {font-weight:100;}
h1 {margin: 1em 0 .5em;}
.group {
  border: 1px solid #fff;
  background-color: rgba(255,255,255,.25);
  padding: .5rem 1rem;
  margin: 1rem auto;
}

.url {
  display: flex;
  width: 100%;
  margin: 1rem auto;
}
[class*="_label"] {
  position: relative;
  white-space: nowrap;
  margin-right: .5em;
  min-width: 4em;
}
[class*="_label"] > span {
  display: block;
  position: relative;
  top: 50%;
  transform: translatey(-50%);
}
[class*="_input"] {
  display: inline-block;
  line-height: 1;
  width: 100%;
  margin: 0;
  padding: .25rem .5rem;
  font: inherit;
  border: 1px solid #fff;
  background-color: rgba(255,255,255,.5);
}


.upload {
  display: flex;
  width: 100%;
  margin: 1rem auto;
}

.player_audio {
  width: 100%;
}
.player_display {
  font-size: 1.25rem;
}
.tempo {
  display: flex;
  width: 100%;
  margin: 1rem auto;
}
.tempo_display {
  font-weight: 700;
  min-width: 3em;
  margin-left: .5em;
}
            
          
!
            
              
const player = document.querySelector('.player_audio');
const playerDisplay = document.querySelector('.player_display');

const changeTempo = function () {
  player.playbackRate = tempoInput.value;
  tempoDisplay.textContent = tempoInput.value;
};

const changeSongURL = function (e) {
  player.src = urlInput.value;
  let filename = player.src.split('\\').pop().split('/').pop();
  playerDisplay.textContent = filename;
}

const changeSongFile = function (e) {
  const target = e.currentTarget;
  const file = target.files[0];
  let reader;

  if (target.files && file) {
    reader = new FileReader();
    reader.onload = function (e) {
      player.setAttribute('src', e.target.result);
      playerDisplay.textContent = file.name;
      // player.play(); // auto play on load
    }
    reader.readAsDataURL(file);
  }
};

// Get the song from:
const urlInput = document.getElementById('url_input');
urlInput.addEventListener("change", changeSongURL, false);


// Or upload an MP3:
const uploadInput = document.getElementById('upload_input');
uploadInput.addEventListener('change', changeSongFile, false);


// Playback tempo 
const tempoInput = document.getElementById('tempo_input');
tempoInput.addEventListener("change", changeTempo, false);
const tempoDisplay = document.querySelector('.tempo_display');
tempoDisplay.textContent = tempoInput.value;



// Chords from:
const vtt = document.getElementById('url_input').value.replace('.mp3', '.vtt');
const player_chords = document.getElementById('player-chords');

player_chords.src = vtt;
// player.src = urlInput.value;
changeSongURL();
changeTempo();
            
          
!
999px
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