diff --git a/cpdctrl/led_script.py b/cpdctrl/led_script.py
index 4ae2827..b697d13 100644
--- a/cpdctrl/led_script.py
+++ b/cpdctrl/led_script.py
@@ -26,12 +26,13 @@ class LedScriptUpdateHandler(FileSystemEventHandler):
         super().__init__()
         self.led_script = led_script
         self.verbose = verbose
-    
+
     def on_modified(self, event):
-        if self.verbose:
-            print("File modified: ", event.src_path)
         filename = os.path.basename(self.led_script.filepath)
+        # print(event.event_type, event.src_path, os.path.basename(event.src_path), filename)
         if os.path.basename(event.src_path) == filename:
+            if self.verbose:
+                print("File modified: ", event.src_path)
             try:
                 self.led_script.update_from_file()
             except ValueError as e:
@@ -43,7 +44,7 @@ class LedScript:
     Class representing a script to control the state of a LED
     """
     ARRAY_DTYPE = [("dt", "f8"), ("dtsum", "f8"), ("led", "i4"), ("line", "i4")]
-    def __init__(self, script:np.ndarray|str|int=0, auto_update=False, on_update_callback:Callable[[], None]|None=None, verbose=False):
+    def __init__(self, script:np.ndarray|str|int=0, auto_update=False, verbose=False):
         """
         Parameters
         ----------
@@ -81,11 +82,24 @@ class LedScript:
             raise ValueError("Invalid value for script: Muse be int, np.ndarray or str")
         self.observer = None
         if self.auto_update:
-           self.start_updating() 
+            self.start_updating()
         self.current_dt = 0
         assert(self.script.shape[0] > 0)
-        self.on_update_callback = on_update_callback
-        
+        self.is_updated = False
+
+    def has_updated(self) -> True:
+        """
+        This is a workaround for when the update needs to be propagated to a QT thread for cpdctrl-gui
+        Returns
+        -------
+           True if the script was updated since the last call to this method
+        """
+        if self.is_updated:
+            self.is_updated = False
+            return True
+        return False
+
+
     def __del__(self):
         self.stop_updating()
 
@@ -214,9 +228,9 @@ class LedScript:
 
         """
         if self.observer is not None:
-            raise ValueError("Already watching for updates")
+            raise RuntimeError("Already watching for updates")
         if self.filepath is None:
-            raise ValueError("Can not watch for updates if the LedScript was not initialized with a file path") 
+            raise RuntimeError("Can not watch for updates if the LedScript was not initialized with a file path")
         # event_handler = LoggingEventHandler()
         event_handler = LedScriptUpdateHandler(self) #, verbose=True)
         self.observer = Observer()
@@ -255,8 +269,8 @@ class LedScript:
         if idx != newidx:
             raise ValueError(f"The duration of the current step {idx+1} in line {newscript['line'][idx]} in the new script is too short TODO") 
         self.script = newscript
-        if self.on_update_callback is not None: self.on_update_callback()
-    
+        self.is_updated = True
+
     @staticmethod
     def parse_script(filepath: str, ignore_errors:bool=False) -> np.ndarray|tuple[np.ndarray, list[InvalidScript]]:
         """