diff -r a8052f8ab19c -r 192d7d7f7bb4 client/annotviz/app/js/doubleroll.js
--- a/client/annotviz/app/js/doubleroll.js	Fri Apr 10 16:45:34 2015 +0200
+++ b/client/annotviz/app/js/doubleroll.js	Mon Apr 13 17:11:47 2015 +0200
@@ -23,9 +23,10 @@
         lineInterval: 5000,
         noteHeight: undefined,
         range: {
-    		bottom: 60,
-    		top: 70,
+    		bottom: 50,
+    		top: 90,
         },
+        dynamicRange: true,
       },
       {
         height: 384,
@@ -36,6 +37,7 @@
     		bottom: 0,
     		top: 128,
         },
+        dynamicRange: false,
       },
     ],
     framerate: 25,
@@ -102,11 +104,19 @@
         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;
     _(opts.pianorolls).forEach(function(prDef, i) {
-        var prNoteHeight = noteHeight || prDef.noteHeight || prDef.height / (prDef.top - prDef.bottom);
+        var prNoteHeight = noteHeight || prDef.noteHeight || prDef.height / (prDef.range.top - prDef.range.bottom + 1);
         var prTimeWidth = prDef.timeWidth || timeWidth;
         pianorollList.push(new PianoRoll(_({
             yInit: yInit,
@@ -116,6 +126,7 @@
             noteHeight: prNoteHeight,
             lineInterval: prDef.lineInterval,
             range: prDef.range,
+            dynamicRange: prDef.dynamicRange,
         }).defaults(pianorollOptions).value()));
         yInit += prDef.height;
         linesDown = !linesDown;