- added Temp controller

- use AttributeChange for Processing objects

utils/value.py

@@ -33,11 +33,14 @@ class ValueChanged(object):
 
 
 class AttributeChange(object):
-	callbacks = {}
+	def __init__(self):
+		self.callbacks = {}
 
-	def set_on_changed(self, key, on_changed: ValueChanged):
+	def set_on_changed(self, key, on_changed):
 		if key not in self.callbacks:
-			self.callbacks[key] = on_changed
+			self.callbacks[key] = [on_changed]
+		else:
+			self.callbacks[key].append(on_changed)
 
 	def __setattr__(self, key, value):
 		try:
@@ -48,4 +51,5 @@ class AttributeChange(object):
 		super().__setattr__(key, value)
 
 		if key in self.callbacks:
-			self.callbacks[key].set(value)
+			for cb in self.callbacks[key]:
+				cb(value)