Download Blob
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An example of example of how to download a blob object in JavaScript.
var a = document.createElement('a');
document.body.appendChild(a);
a.style.display = 'none';
var blob = new Blob([audio], {type: 'audio/mpeg'});
var url = window.URL.createObjectURL(blob);
a.href = url;
a.download = 'file.mp3';
a.click();
window.URL.revokeObjectURL(url);