     @addFunction(fTrees, @settings, "deleteActiveTree", "Delete Active Tree")
 
     fNodes = @gui.addFolder("Nodes")
-    @activeNodeIdController = @addNumer(fNodes, @settings, "activeNodeID", 1, 1, "Active Node ID")
+    @activeNodeIdController = @addNumber(fNodes, @settings, "activeNodeID",
+      1, 1, "Active Node ID")
     @commentController =
     (fNodes.add @settings, "comment")
                           .name("Comment")

    @addCheckbox(fSkeleton, @user, "displayPreviewXZ", "Display XZ-Plane")

    fTrees = @gui.addFolder("Trees")
    @activeTreeIdController = @addNumer(fTrees, @settings, "activeTreeID", 1, 1, "Active Tree ID")
    if somaClickingAllowed
      @addCheckbox(fTrees, @settings, "newNodeNewTree", "Soma clicking mode")
    else

    @addCheckbox(fControls, @user, "dynamicSpaceDirection", "d/f-Switching")

    fFlightcontrols = @gui.addFolder("Flighcontrols")
    @addSlider(fFlightcontrols, @user, "mouseRotateValue",
      0.001, 0.02, 0.001, "Mouse Rotation")
    @addSlider(fFlightcontrols, @user, "rotateValue",
      0.001, 0.08, 0.001, "Keyboard Rotation Value")
    @addSlider(fFlightcontrols, @user, "moveValue3d",
      0.1, 10, 0.1, "Move Value")
    @addSlider(fFlightcontrols, @user, "crosshairSize",
      0.1, 1, 0.01, "Crosshair size")

    fPlanes = @gui.addFolder("Planes")
    @addSlider(fPlanes, @user, "moveValue",
      0.1, 10, 0.1, "Move Value")
    @addSlider(fPlanes, @user, "routeClippingDistance",
      1, 1000 * @model.scaleInfo.baseVoxel, 1, "Clipping Distance")
    @addCheckbox(fPlanes, @user, "displayCrosshair", "Show Crosshairs")

    fVoxel = @gui.addFolder("Voxel")
    @addCheckbox(fVoxel, @settings, "fourBit", "4 Bit")
    @brightnessController =
      @addSlider(fVoxel, @settings, "brightness",
        -256, 256, 5, "Brightness", @setBrightnessAndContrast)
    @contrastController =
      @addSlider(fVoxel, @settings, "contrast",
        0.5, 5, 0.1, "Contrast", @setBrightnessAndContrast)
    @addFunction(fVoxel, @settings, "resetBrightnessAndContrast",
      "Reset To Default")
    @addCheckbox(fVoxel, @user, "interpolation", "Interpolation")
    (fVoxel.add @settings, "quality", @qualityArray)
                          .name("Quality")
