diff --git a/UserInterfaceManager.cpp b/UserInterfaceManager.cpp
index c41360d..5087456 100644
--- a/UserInterfaceManager.cpp
+++ b/UserInterfaceManager.cpp
@@ -219,13 +219,14 @@ bool UserInterface::Init()
 
 void UserInterface::handleKeyboard()
 {
-    ImGuiIO& io = ImGui::GetIO(); 
+    ImGuiIO& io = ImGui::GetIO();
+    alt_modifier_active = io.KeyAlt;
     auto ctrl = io.ConfigMacOSXBehaviors ? io.KeySuper : io.KeyCtrl;
 
     // Application "CTRL +"" Shortcuts
     if ( ctrl ) {
 
-        keyboard_modifier_active = true;
+        ctrl_modifier_active = true;
 
         if (ImGui::IsKeyPressed( GLFW_KEY_Q ))  {
             // Quit
@@ -233,7 +234,7 @@ void UserInterface::handleKeyboard()
         }
         else if (ImGui::IsKeyPressed( GLFW_KEY_O )) {
             // SHIFT + CTRL + O : reopen current session
-            if (keyboard_modifier_active && !Mixer::manager().session()->filename().empty())
+            if (ctrl_modifier_active && !Mixer::manager().session()->filename().empty())
                 Mixer::manager().load( Mixer::manager().session()->filename() );
             // CTRL + O : Open session
             else
@@ -287,7 +288,7 @@ void UserInterface::handleKeyboard()
     }
     // No CTRL modifier
     else {
-        keyboard_modifier_active = false;
+        ctrl_modifier_active = false;
 
         // Application F-Keys
         if (ImGui::IsKeyPressed( GLFW_KEY_F1 ))
@@ -424,7 +425,7 @@ void UserInterface::handleMouse()
                     Source *s = Mixer::manager().findSource(picked.first);
                     if (s != nullptr) {
                         // CTRL + clic = multiple selection
-                        if (keyboard_modifier_active) {
+                        if (ctrl_modifier_active) {
                             if ( !Mixer::selection().contains(s) )
                                 Mixer::selection().add( s );
                             else {
diff --git a/UserInterfaceManager.h b/UserInterfaceManager.h
index 98d7ebd..c7096fd 100644
--- a/UserInterfaceManager.h
+++ b/UserInterfaceManager.h
@@ -104,7 +104,8 @@ class UserInterface
     ToolBox toolbox;
     MediaController mediacontrol;
 
-    bool keyboard_modifier_active;
+    bool ctrl_modifier_active;
+    bool alt_modifier_active;
     bool show_vimix_config;
     bool show_imgui_about;
     bool show_gst_about;
@@ -145,7 +146,8 @@ public:
     void Terminate();
 
     // status querries
-    inline bool keyboardModifier() { return keyboard_modifier_active; }
+    inline bool ctrlModifier() const { return ctrl_modifier_active; }
+    inline bool altModifier() const  { return alt_modifier_active; }
 
     void StartScreenshot();
     void showPannel(int id = 0);
diff --git a/View.cpp b/View.cpp
index ca65fec..0413ce2 100644
--- a/View.cpp
+++ b/View.cpp
@@ -752,7 +752,7 @@ View::Cursor GeometryView::grab (Source *s, glm::vec2 from, glm::vec2 to, std::p
     if (pick.first)  {
         // picking on the resizing handles in the corners
         if ( pick.first == s->handle_[Handles::RESIZE] ) {
-            if (UserInterface::manager().keyboardModifier())
+            if (UserInterface::manager().altModifier())
                 S_resize.y = S_resize.x;
             sourceNode->scale_ = s->stored_status_->scale_ * S_resize;
 
@@ -774,7 +774,7 @@ View::Cursor GeometryView::grab (Source *s, glm::vec2 from, glm::vec2 to, std::p
         // picking on the resizing handles left or right
         else if ( pick.first == s->handle_[Handles::RESIZE_H] ) {
             sourceNode->scale_ = s->stored_status_->scale_ * glm::vec3(S_resize.x, 1.f, 1.f);
-            if (UserInterface::manager().keyboardModifier())
+            if (UserInterface::manager().altModifier())
                 sourceNode->scale_.x = float( int( sourceNode->scale_.x * 10.f ) ) / 10.f;
 
             ret.type = Cursor_ResizeEW;
@@ -784,7 +784,7 @@ View::Cursor GeometryView::grab (Source *s, glm::vec2 from, glm::vec2 to, std::p
         // picking on the resizing handles top or bottom
         else if ( pick.first == s->handle_[Handles::RESIZE_V] ) {
             sourceNode->scale_ = s->stored_status_->scale_ * glm::vec3(1.f, S_resize.y, 1.f);
-            if (UserInterface::manager().keyboardModifier())
+            if (UserInterface::manager().altModifier())
                 sourceNode->scale_.y = float( int( sourceNode->scale_.y * 10.f ) ) / 10.f;
 
             ret.type = Cursor_ResizeNS;
@@ -803,7 +803,7 @@ View::Cursor GeometryView::grab (Source *s, glm::vec2 from, glm::vec2 to, std::p
             sourceNode->rotation_ = s->stored_status_->rotation_ + glm::vec3(0.f, 0.f, angle);
 
             int degrees = int(  glm::degrees(sourceNode->rotation_.z) );
-            if (UserInterface::manager().keyboardModifier()) {
+            if (UserInterface::manager().altModifier()) {
                 degrees = (degrees / 10) * 10;
                 sourceNode->rotation_.z = glm::radians( float(degrees) );
             }
@@ -815,7 +815,7 @@ View::Cursor GeometryView::grab (Source *s, glm::vec2 from, glm::vec2 to, std::p
         else {
             sourceNode->translation_ = s->stored_status_->translation_ + gl_Position_to - gl_Position_from;
 
-            if (UserInterface::manager().keyboardModifier()) {
+            if (UserInterface::manager().altModifier()) {
                 sourceNode->translation_.x = float( int( sourceNode->translation_.x * 10.f ) ) / 10.f;
                 sourceNode->translation_.y = float( int( sourceNode->translation_.y * 10.f ) ) / 10.f;
             }