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HTML

              
                <p>
  <button id="boton">&#9655;</button>
  <input id="volumen" type="range" value=".5" max ="2" step="0.01"  />
</p>
              
            
!

CSS

              
                html,body{height:100vh; background:#d9d9d9;}
p{text-align:center;margin:0 auto; margin-top:calc(50vh - 2em); }
input{width:6em;}
button{width:3em; height:3em;}
              
            
!

JS

              
                //Creamos un nuevo AudioContext.
// Safary y Opera todavía necesitan el prefijo webkit
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
var audioBuffer, fuenteDeReproduccion, gain;
var stop = true;
var tiempo = 0;
var elVolumen = .5;

function solicitarAudio(url) {
  var request = new XMLHttpRequest();

  request.open("GET",url, true);
  // el objeto arraybuffer se utiliza para almacenar datos binarios (archivos de sonido)
  request.responseType = "arraybuffer";
  // si hay respuesta
  request.onload = function() {
    audioCtx.decodeAudioData(request.response, function(buffer) {
      audioBuffer = buffer;
    });
  };

  //envía la solicitud
  request.send();
}

function reproducirAudio() {
    //1. crea la fuente de reproducción
    fuenteDeReproduccion = audioCtx.createBufferSource();
    // 2 crea un nuevo nodo de ganancia
    gain = audioCtx.createGain();
    gain.gain.value = elVolumen;// ajusta el volumen del sonido
    // 3. establece la fuente de reproducción
    fuenteDeReproduccion.buffer = audioBuffer;
    // 4. Conecta la fuente de reproducción con el nodo de ganancia 
    fuenteDeReproduccion.connect(gain);
    // y el nodo de ganancia su destino ( altavoces, auriculares . . . etc )
    gain.connect(audioCtx.destination);
    // 5. Inicia la reproducción
    fuenteDeReproduccion.start(audioCtx.currentTime);
}

function detenerAudio() {
    fuenteDeReproduccion.stop();
}

function audio(){  
  if (stop) {// si el audio está parado
    tiempo = audioCtx.currentTime;
    stop = false;
    boton.innerHTML = "||";//detener
    reproducirAudio();
  }else{// de lo contrario
    stop = true;
    boton.innerHTML = "&#9655;";//reproducir
    detenerAudio();
  }
}

solicitarAudio(
  "https://s3-us-west-2.amazonaws.com/s.cdpn.io/222579/Kevin_MacLeod_-_Camille_Saint-Sans_Danse_Macabre_-_Finale.mp3"
);

// Utiliza el evento click para iniciar o detener la reproducción
boton.addEventListener("click", audio, false);

window.setInterval( function(){  
 if(audioBuffer && audioCtx.currentTime - tiempo >= audioBuffer.duration){
    stop = true;
    boton.innerHTML = "&#9655;"//reproducir
    porcien = 0;
 }
},1000/30);

volumen.addEventListener("input", function(){
  elVolumen = this.value;
  gain.gain.value = elVolumen;// ajusta el volumen del sonido
}, false);


              
            
!
999px

Console