vors

var trackElements = document.querySelectorAll(".audio");
 
console.log("Loaded " + trackElements.length + " track");
 
var tracks = [];
for (var i = 0; i < trackElements.length; ++i) {
    var trackElement = trackElements[i];
    var input = trackElement.querySelector("input");
    var title = trackElement.querySelector(".title_wrap");
    if (!input || !title) {