diff --git a/light8/Patch.py b/light8/Patch.py
--- a/light8/Patch.py
+++ b/light8/Patch.py
@@ -8,7 +8,7 @@ def get_dmx_channel(name):
         i = int(name)
         return i
     except ValueError:
-        raise "Invalid channel name:", name
+        raise ValueError("Invalid channel name: %s" % name)
 
 def get_channel_name(dmxnum):
     try:
diff --git a/light8/subediting.py b/light8/subediting.py
--- a/light8/subediting.py
+++ b/light8/subediting.py
@@ -38,13 +38,10 @@ class Subediting:
         self.startlevels = self.sub.getlevels()
 
     def getcurrentlevel(self,lightname):
-        print "resolve",lightname
-        ch = get_dmx_channel(lightname)
         try:
             ch = get_dmx_channel(lightname)
         except ValueError:
             return None
-        print "resolved ch",ch
         return self.currentoutputlevels[ch]
 
     def levelchange(self,lightnames,delta):