38     var doubleroll = new annotviz.DoubleRoll({

    38     var doubleroll = new annotviz.DoubleRoll({

    39     	logger: logger,

    39     	logger: logger,

    40         stageView: stageView,

    40         stageView: stageView,

    41         ws: new annotviz.WsWrapper(wsUri),

    41         ws: new annotviz.WsWrapper(wsUri),

    42     	orientation: 'horizontal',

    42     	orientation: 'horizontal',

    43     	sceneWidth: 1024,

    44     	sceneWidth: 1024,

    44     	sceneHeight: 768,

    45     	sceneHeight: 768,

    45     	zeroShift: 1,

    46     	zeroShift: 1,

    46         pianorolls : [

    47         pianorolls : [

    47 		  {

    48 		  {