diff --git a/v5/desktop_SequentialTimer.py b/v5/desktop_SequentialTimer.py
index ae687c4..f4708b9 100644
--- a/v5/desktop_SequentialTimer.py
+++ b/v5/desktop_SequentialTimer.py
@@ -3,7 +3,7 @@ import time
 class desktop_SequentialTimer():
   def __init__(self):
     self.activeTimeout = None
-    self.ctrl = None
+    self.callback = None
     self.queue = []
   #}
 
@@ -26,7 +26,7 @@ class desktop_SequentialTimer():
       value = self.queue[0][2]
       self.queue.pop(0)
       self.activeTimeout = None
-      self.ctrl.set(key, value)
+      self.callback(key, value)
     #}
   #}
 
diff --git a/v5/main-gui.py b/v5/main-gui.py
index abc4620..4df07a1 100644
--- a/v5/main-gui.py
+++ b/v5/main-gui.py
@@ -75,16 +75,15 @@ ctrl.registerFunctions([
   memory_selectItem,
 ])
 
-def printOutput(c):
-  if c.recentField.startswith("output"):
-    print(c.field(c.recentField))
-ctrl.registerCallback(printOutput)
+def printDbg(c):
+  print(f"Dbg key/value: '{c.recentField}'/'{c.field(c.recentField)}'")
+ctrl.registerCallback(printDbg)
 ctrl.registerFieldCallback("exit", lambda c: sys.exit(0))
 
 p = desktop_Platform()
 p.ctrl = ctrl
 p.sequentialTimer = desktop_SequentialTimer()
-p.sequentialTimer.ctrl = ctrl
+p.sequentialTimer.callback = lambda key, value: ctrl.set(key, value)
 
 # Copy context to platform.
 # And process lots of functions that are interested in changes.