diff -r 21634b2d7609 -r 3a74c554c9b9 client/annotviz/app/js/doubleroll.js
--- a/client/annotviz/app/js/doubleroll.js	Tue Apr 14 11:30:51 2015 +0200
+++ b/client/annotviz/app/js/doubleroll.js	Wed Apr 15 18:26:59 2015 +0200
@@ -104,14 +104,6 @@
         lineInterval: lineInterval,
         offsetMusic: offsetMusic,
     };
-    
-    var lineGraphics = new PIXI.Graphics()
-	    .beginFill(this.lineFillColor)
-	    .lineStyle(1, this.lineColor)
-	    .moveTo(Math.floor(sceneWidth*zeroShift), 0)
-	    .lineTo(-sceneWidth - Math.floor(sceneWidth*zeroShift), 0)
-	    .endFill();
-	this.container.addChild(lineGraphics);
 
     var yInit = opts.yInit || 0;
     var linesDown = true;