foldi

<h1>Audio visualization</h1>
<script>
  var numRows = 16, bars = [];
  for (var i = 0; i < numRows * 2; i++) {
    var bar = document.createElement('meter');
    bar.min = -1;
    document.body.appendChild(bar);
 
    // Add a newline after each pair of bars.
    if (i % 2) document.body.appendChild(document.createElement('br'));