download(fileName = 'micro_record') {
    var link = document.createElement('a');
    var click = document.createEvent("Event");

    link.href = this.getUrl();
    link.download = `${fileName}.mp3`;

    click.initEvent("click", true, true);
    link.dispatchEvent(click);
  }
Forces file download.

@param  {String} fileName 

@return {void}