code: function Sequence( ac, tempo, arr ) {
    this.ac = ac || new AudioContext();
    this.createFxNodes();
    this.tempo = tempo || 120;
    this.loop = true;
    this.smoothing = 0;
    this.staccato = 0;
    this.notes = [];
    this.push.apply( this, arr || [] );
  }
docs: /*
  Sequence class
   create a new Sequence