//This is audio from my video, which is exporting successfully.
	var audioCtx = new AudioContext();
    var dest = audioCtx.createMediaStreamDestination();
    aStream = dest.stream;
    var myVid = document.getElementById("p5video");
    var sourceNode = audioCtx.createMediaElementSource(myVid);
    sourceNode.connect(dest);
    sourceNode.connect(audioCtx.destination);

	//This is the audio from the mp3 I'd like to add to my stream.
    var dest2 = audioCtx.createMediaStreamDestination();
    bStream = dest2.stream;
    var gj = document.getElementById('greatJob');
    var sourceNode2 = audioCtx.createMediaElementSource(gj);
    sourceNode2.connect(dest2);
    sourceNode2.connect(audioCtx.destination);

    startStream();


//And here's my function for starting the MediaStream and adding the audio tracks + a canvas.
var myCanvas;
var canvasPublish;

function startStream(){
  if(editMode === true){
     myCanvas = document.getElementById("p5canvas");
    canvasPublish = myCanvas.captureStream();
    canvasPublish.addTrack(aStream.getAudioTracks()[0]);
    canvasPublish.addTrack(bStream.getAudioTracks()[0]);
  }
}