function play(mybuffer) {
  const sourceNode = context.createBufferSource();
  sourceNode.buffer = mybuffer;

  const filterNode = context.createBiquadFilter();
  filterNode.type = "highpass";
  filterNode.frequency.value = 1000;

  sourceNode.connect(filterNode);
  filterNode.connect(context.destination);
  sourceNode.start(0);
}