After you get a return value as "file" from filepicker, convert the result to a fileURL->
var fileLocation = window.URL.createObjectURL(file, { oneTimeOnly: true });
then you can just set the audio source of a HTML5 audio element->
audtag.setAttribute("src", fileLocation);
audtag.load();
then you can play it like->
audtag.play();
or if you give the user controls under the audio tag, then you can let them play, pause or stop.