diff --git a/source/carla_host.py b/source/carla_host.py
index efa66326e..1281ac5b9 100644
--- a/source/carla_host.py
+++ b/source/carla_host.py
@@ -670,7 +670,7 @@ class HostWindow(QMainWindow):
     # --------------------------------------------------------------------------------------------------------
     # Engine (host callbacks)
 
-    @pyqtSlot(str)
+    @pyqtSlot(int, int, str)
     def slot_handleEngineStartedCallback(self, processMode, transportMode, driverName):
         self.ui.menu_PluginMacros.setEnabled(True)
         self.ui.menu_Canvas.setEnabled(True)
diff --git a/source/carla_panels.py b/source/carla_panels.py
index 9cf36a5e7..eebc76d01 100644
--- a/source/carla_panels.py
+++ b/source/carla_panels.py
@@ -222,7 +222,7 @@ class CarlaPanelTime(QDialog):
     # --------------------------------------------------------------------------------------------------------
     # Engine callbacks
 
-    @pyqtSlot(str)
+    @pyqtSlot(int, int, str)
     def slot_handleEngineStartedCallback(self, processMode, transportMode, driverName):
         self.fSampleRate = self.host.get_sample_rate()
         self.refreshTransport(True)
diff --git a/source/carla_skin.py b/source/carla_skin.py
index deaf3bbdd..3780bd41e 100755
--- a/source/carla_skin.py
+++ b/source/carla_skin.py
@@ -1217,7 +1217,7 @@ class AbstractPluginSlot(QFrame, PluginEditParentMeta):
 
     #------------------------------------------------------------------
 
-    @pyqtSlot(int)
+    @pyqtSlot(float)
     def slot_parameterValueChanged(self, value):
         index = self.sender().getIndex()
 
diff --git a/source/carla_widgets.py b/source/carla_widgets.py
index 143d1c914..28383860c 100755
--- a/source/carla_widgets.py
+++ b/source/carla_widgets.py
@@ -1273,35 +1273,35 @@ class PluginEdit(QDialog):
 
     #------------------------------------------------------------------
 
-    @pyqtSlot(int)
+    @pyqtSlot(float)
     def slot_dryWetChanged(self, value):
         self.host.set_drywet(self.fPluginId, value)
 
         if self.fParent is not None:
             self.fParent.editDialogParameterValueChanged(self.fPluginId, PARAMETER_DRYWET, value)
 
-    @pyqtSlot(int)
+    @pyqtSlot(float)
     def slot_volumeChanged(self, value):
         self.host.set_volume(self.fPluginId, value)
 
         if self.fParent is not None:
             self.fParent.editDialogParameterValueChanged(self.fPluginId, PARAMETER_VOLUME, value)
 
-    @pyqtSlot(int)
+    @pyqtSlot(float)
     def slot_balanceLeftChanged(self, value):
         self.host.set_balance_left(self.fPluginId, value)
 
         if self.fParent is not None:
             self.fParent.editDialogParameterValueChanged(self.fPluginId, PARAMETER_BALANCE_LEFT, value)
 
-    @pyqtSlot(int)
+    @pyqtSlot(float)
     def slot_balanceRightChanged(self, value):
         self.host.set_balance_right(self.fPluginId, value)
 
         if self.fParent is not None:
             self.fParent.editDialogParameterValueChanged(self.fPluginId, PARAMETER_BALANCE_RIGHT, value)
 
-    @pyqtSlot(int)
+    @pyqtSlot(float)
     def slot_panChanged(self, value):
         self.host.set_panning(self.fPluginId, value)