diff --git a/Functions/Plugins/ParameterGUI/BpodParameterGUI.m b/Functions/Plugins/ParameterGUI/BpodParameterGUI.m
index cc41c15..a9890ed 100644
--- a/Functions/Plugins/ParameterGUI/BpodParameterGUI.m
+++ b/Functions/Plugins/ParameterGUI/BpodParameterGUI.m
@@ -102,8 +102,11 @@
                     else
                         BpodSystem.GUIData.ParameterGUI.LastParamValues{ParamNum} = ThisParam;
                     end
+                    ThisParamStyle = 'edit'; % Just initial assumption
+                    ThisParamCB = '';
                     if isfield(Meta, ThisParamName)
                         if isstruct(Meta.(ThisParamName))
+                            ValidField = false;
                             if isfield(Meta.(ThisParamName), 'Style')
                                 ThisParamStyle = Meta.(ThisParamName).Style;
                                 if isfield(Meta.(ThisParamName), 'String')
@@ -111,41 +114,41 @@
                                 else
                                     ThisParamString = '';
                                 end
-                            else
-                                error(['Style not specified for parameter ' ThisParamName '.'])
+                                ValidField = true;
+                            end
+                            if isfield(Meta.(ThisParamName), 'Callback')
+                                ThisParamCB = Meta.(ThisParamName).Callback;
+                                ValidField = true;
+                            end
+                            if ~ValidField
+                                error(['Style or Callback not specified for parameter ' ThisParamName '.'])
                             end
                         else
                             error(['GUIMeta entry for ' ThisParamName ' must be a struct.'])
                         end
-                    else
-                        ThisParamStyle = 'edit';
-                        ThisParamValue = NaN;
                     end
                     BpodSystem.GUIHandles.ParameterGUI.Labels(ParamNum) = uicontrol(htab,'Style', 'text', 'String', ThisParamName, 'Position', [HPos+5 VPos+InPanelPos 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center');
                     switch lower(ThisParamStyle)
                         case 'edit'
                             BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 1;
-                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'edit', 'String', num2str(ThisParam), 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center');
-                        case 'edittext'
-                            BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 8;
-                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'edit', 'String', ThisParam, 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center');
+                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'edit', 'String', num2str(ThisParam), 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center','Callback',ThisParamCB);
                         case 'text'
                             BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 2;
-                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'text', 'String', num2str(ThisParam), 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center');
+                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'text', 'String', num2str(ThisParam), 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center','Callback',ThisParamCB);
                         case 'checkbox'
                             BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 3;
-                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'checkbox', 'Value', ThisParam, 'String', '   (check to activate)', 'Position', [HPos+220 VPos+InPanelPos+4 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center');
+                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'checkbox', 'Value', ThisParam, 'String', '   (check to activate)', 'Position', [HPos+220 VPos+InPanelPos+4 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center','Callback',ThisParamCB);
                         case 'popupmenu'
                             BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 4;
-                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'popupmenu', 'String', ThisParamString, 'Value', ThisParam, 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center');
+                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'popupmenu', 'String', ThisParamString, 'Value', ThisParam, 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center','Callback',ThisParamCB);
                         case 'togglebutton' % INCOMPLETE
                             BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 5;
-                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'togglebutton', 'String', ThisParamString, 'Value', ThisParam, 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center');
+                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'togglebutton', 'String', ThisParamString, 'Value', ThisParam, 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center','Callback',ThisParamCB);
                         case 'pushbutton'
                             BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 6;
                             BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'pushbutton', 'String', ThisParamString,...
                                 'Value', ThisParam, 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12,...
-                                'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center','Callback',Meta.OdorSettings.Callback);
+                                'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center','Callback',ThisParamCB);
                         case 'table'
                             BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 7;
                             columnNames = fieldnames(Params.(ThisParamName));
@@ -167,8 +170,18 @@
                             ThisPanelHeight = ThisPanelHeight + (htable.Position(4)-25);
                             BpodSystem.GUIHandles.ParameterGUI.Panels.(ThisTabPanelNames{p}).Position(4) = ThisPanelHeight;
                             BpodSystem.GUIData.ParameterGUI.LastParamValues{ParamNum} = htable.Data;
+                        case 'edittext'
+                            BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 8;
+                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'edit', 'String', ThisParam, 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12, 'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center','Callback',ThisParamCB);
+                        case 'slider'
+                            BpodSystem.GUIData.ParameterGUI.Styles(ParamNum) = 9;
+                            BpodSystem.GUIHandles.ParameterGUI.Params{ParamNum} = uicontrol(htab,'Style', 'slider', 'String', ThisParam,...
+                                'Value', ThisParam, 'Position', [HPos+220 VPos+InPanelPos+2 200 25], 'FontWeight', 'normal', 'FontSize', 12,...
+                                'BackgroundColor','white', 'FontName', 'Arial','HorizontalAlignment','Center', 'min', 0, 'max', 1,...
+                                'Callback',ThisParamCB);
+
                         otherwise
-                            error('Invalid parameter style specified. Valid parameters are: ''edit'', ''text'', ''checkbox'', ''popupmenu'', ''togglebutton'', ''pushbutton''');
+                            error('Invalid parameter style specified. Valid parameters are: ''edit'', ''text'', ''checkbox'', ''popupmenu'', ''togglebutton'', ''pushbutton'', ''slider''');
                     end
                     InPanelPos = InPanelPos + 35;
                     ParamNum = ParamNum + 1;
@@ -216,13 +229,6 @@
                     elseif Params.GUI.(ThisParamName) ~= ThisParamLastValue
                         set(ThisParamHandle, 'String', num2str(GUIParam));
                     end
-                case 8 % Edit Text
-                    GUIParam = get(ThisParamHandle, 'String');
-                    if ~strcmpi(GUIParam, ThisParamLastValue)
-                        Params.GUI.(ThisParamName) = GUIParam;
-                    elseif ~strcmpi(Params.GUI.(ThisParamName), ThisParamLastValue)
-                        set(ThisParamHandle, 'String', GUIParam);
-                    end                                     
                 case 2 % Text
                     GUIParam = Params.GUI.(ThisParamName);
                     Text = GUIParam;
@@ -265,6 +271,20 @@
                     elseif any(argData(:) ~= ThisParamLastValue(:)) % Change originated in TaskParameters propagates to the GUI
                         ThisParamHandle.Data = argData;
                     end
+                case 8 % Edit Text
+                    GUIParam = get(ThisParamHandle, 'String');
+                    if ~strcmpi(GUIParam, ThisParamLastValue)
+                        Params.GUI.(ThisParamName) = GUIParam;
+                    elseif ~strcmpi(Params.GUI.(ThisParamName), ThisParamLastValue)
+                        set(ThisParamHandle, 'String', GUIParam);
+                    end
+                case 9 % Slider
+                    GUIParam = get(ThisParamHandle, 'Value');
+                    if GUIParam ~= ThisParamLastValue
+                        Params.GUI.(ThisParamName) = GUIParam;
+                    elseif Params.GUI.(ThisParamName) ~= ThisParamLastValue
+                        set(ThisParamHandle, 'Value', GUIParam);
+                    end
             end
             BpodSystem.GUIData.ParameterGUI.LastParamValues{p} = GUIParam;
         end