--- a/annot-server/static/js/pianoroll.js	Tue Oct 28 09:47:11 2014 +0100
+++ b/annot-server/static/js/pianoroll.js	Tue Oct 28 15:31:55 2014 +0100
@@ -110,13 +110,18 @@
             }
             i++;
         }
+        //console.log("before : ", nbChilds, ", after : ", _this.container.children.length);
     };
-
+    
+    // remove notes each scene width
+    var removeInterval = window.setInterval(this.removePassedObjets, 1000 * sceneWidth / this.pixelsPerSecond );
+    
 }
 
 // Init containers
-var container1 = new PianoRoll(uberContainer, 0, 0, prHeight1, true, pixelsPerSecond1, sceneWidth);
-var container2 = new PianoRoll(uberContainer, 0, prHeight1, prHeight2, false, pixelsPerSecond2, sceneWidth);
+var containerList = [];
+containerList.push(new PianoRoll(uberContainer, 0, 0, prHeight1, true, pixelsPerSecond1, sceneWidth));
+containerList.push(new PianoRoll(uberContainer, 0, prHeight1, prHeight2, false, pixelsPerSecond2, sceneWidth));
 
 // Line between two containers
 var graphics = new PIXI.Graphics();
@@ -131,8 +136,10 @@
 function replaceContainers(){
     var diff = (Date.now() - timePageLoaded)/1000;// nb of seconds since page loaded
     //console.log("replace ! diff1 = ", container1.x - Math.floor(-diff*pixelsPerSecond1), ", diff 2 = ", container2.x - Math.floor(-diff*pixelsPerSecond2));
-    container1.moveTo(-diff);
-    container2.moveTo(-diff);
+    var nb = containerList.length;
+    for(var i=0;i<nb;i++){
+        containerList[i].moveTo(-diff);
+    }
     renderer.render(stage);
 }
 
@@ -152,11 +159,11 @@
             // We close the note in container one
             //console.log("coucou 2", data);
             var duration = data.content[1] - noteDict[data.content[2]][note].ts;
-            //addNoteInContainer(note, noteDict[data.content[2]][note].ts, duration, noteDict[data.content[2]][note].velocity, pixelsPerSecond1, container1, prHeight1, data.content[2]);
-            //         addNote(note, startTime,                          duration, velocity,                                 canal)
-            container1.addNote(note, noteDict[data.content[2]][note].ts, duration, noteDict[data.content[2]][note].velocity, data.content[2]);
-            //addNoteInContainer(note, noteDict[data.content[2]][note].ts, duration, noteDict[data.content[2]][note].velocity, pixelsPerSecond2, container2, prHeight2, data.content[2]);
-            container2.addNote(note, noteDict[data.content[2]][note].ts, duration, noteDict[data.content[2]][note].velocity, data.content[2]);
+            var nb = containerList.length;
+            for(var i=0;i<nb;i++){
+                //               addNote(note, startTime,                          duration, velocity,                                 canal)
+                containerList[i].addNote(note, noteDict[data.content[2]][note].ts, duration, noteDict[data.content[2]][note].velocity, data.content[2]);
+            }
             // delete entry
             delete noteDict[data.content[2]][note];
         }
@@ -171,8 +178,10 @@
 
 function addLine(){
     nbLines++;
-    container1.addLine(nbLines);
-    container2.addLine(nbLines);
+    var nb = containerList.length;
+    for(var i=0;i<nb;i++){
+        containerList[i].addLine(nbLines);
+    }
 }
 
 
@@ -213,25 +222,25 @@
     }
 
     if (sock) {
-       sock.onopen = function(){
-           if(logger){
-               log("Connected to " + wsuri);
-           }
-       }
+        sock.onopen = function(){
+            if(logger){
+                log("Connected to " + wsuri);
+            }
+        }
 
-       sock.onclose = function(e) {
-           if(logger){
-               log("Connection closed (wasClean = " + e.wasClean + ", code = " + e.code + ", reason = '" + e.reason + "')");
-           }
-          sock = null;
-       }
+        sock.onclose = function(e) {
+            if(logger){
+                log("Connection closed (wasClean = " + e.wasClean + ", code = " + e.code + ", reason = '" + e.reason + "')");
+            }
+            sock = null;
+        }
 
-       sock.onmessage = function(e) {
-           if(logger){
-               log("Got message: " + e.data);
-           }
-           addNotes(JSON.parse(e.data));
-       }
+        sock.onmessage = function(e) {
+            if(logger){
+                log("Got message: " + e.data);
+            }
+            addNotes(JSON.parse(e.data));
+        }
     }
 };
 
@@ -240,8 +249,6 @@
 addLine();
 var moveInterval = window.setInterval(replaceContainers, 1000/manualFramerate);
 var verticalLinesInterval = window.setInterval(addLine, lineInterval);
-var removeInterval1 = window.setInterval(container1.removePassedObjets, 1000 * sceneWidth / pixelsPerSecond1 );
-var removeInterval2 = window.setInterval(container2.removePassedObjets, 1000 * sceneWidth / pixelsPerSecond2 );
 
 // Little inteval to show time
 var nbSec = 0;