Snippet to pull album from discogs and generate a .cue file

cuemaker.js

var url = 'http://api.discogs.com/masters/365003';

function Cue(albumArtist, title, tracks) {
    this.PERFORMER = albumArtist;
    this.TITLE = title;
    this.TRACKS = tracks;
};


function Track(trackNumber, artist, title, offset) {
    this.TITLE = title;
    this.PERFORMER = artist;
    this.TRACK = trackNumber + ' AUDIO';
    this.INDEX = '01 ' + offset;
};

Number.prototype.toMMSS = function () {
    var sec_num = parseInt(this, 10);
    var minutes = Math.floor(sec_num / 60);
    var seconds = sec_num - (minutes * 60);

    if (minutes < 10) {
        minutes = "0" + minutes;
    }
    if (seconds < 10) {
        seconds = "0" + seconds;
    }
    var time = minutes + ':' + seconds;
    return time;
}

var CueMaker = {
    processDiscogs : function (response) {
        //console.log(response);
        discs = [];
        response.tracklist.forEach(function (track) {
            if (track.duration != '' && track.position != '') {
                if (typeof seconds === 'undefined') {
                    seconds = 0
                }
                _track = track.position.split('-');
                if (this[_track[0]] == undefined) {
                    this[_track[0]] = [];
                }
                trackId = ('00' + parseInt(_track[1])).substr(-2);

                minutesSeconds = track.duration.split(':');
                seconds += minutesSeconds[0] * 60 + ~~minutesSeconds[1];
                offset = seconds.toMMSS();

                newTrack = new Track(trackId, track.artists[0].name, track.title, offset);
                this[_track[0]].push(newTrack);
            }
        }, discs);
        cues = [];
        discs.forEach(function (disc) {
            this.push(new Cue(response.artists[0].name, response.title, disc))
        }, cues);
    console.log(cues);
    }

}

$.get(url, CueMaker.processDiscogs);