diff --git a/reactive-midyim.cabal b/reactive-midyim.cabal
--- a/reactive-midyim.cabal
+++ b/reactive-midyim.cabal
@@ -1,5 +1,5 @@
 Name:             reactive-midyim
-Version:          0.4.1
+Version:          0.4.1.1
 License:          BSD3
 License-File:     LICENSE
 Author:           Henning Thielemann <haskell@henning-thielemann.de>
@@ -44,7 +44,7 @@
 Source-Repository this
   type:     darcs
   location: http://hub.darcs.net/thielema/reactive-midyim/
-  tag:      0.4.1
+  tag:      0.4.1.1
 
 Library
   Build-Depends:
@@ -55,7 +55,7 @@
     data-accessor-transformers >=0.2.1 && <0.3,
     data-accessor >=0.2.1 && <0.3,
     utility-ht >=0.0.5 && <0.1,
-    containers >=0.2 && <0.6,
+    containers >=0.2 && <0.7,
     transformers >=0.2 && <0.6,
     semigroups >=0.1 && <1.0,
     random >=1 && <2,
diff --git a/src/Reactive/Banana/MIDI/Process.hs b/src/Reactive/Banana/MIDI/Process.hs
--- a/src/Reactive/Banana/MIDI/Process.hs
+++ b/src/Reactive/Banana/MIDI/Process.hs
@@ -448,6 +448,11 @@
    xs <- RBF.plainChanges x
    fmap RB.filterJust $
       flip RBU.mapAdjacent x0 (\old new -> toMaybe (new/=old) new) xs
+--   return xs
+{-
+   return $ RB.filterJust $ fst $
+      RB.mapAccum x0 $ fmap (\new old -> (toMaybe (new/=old) new, new)) xs
+-}
 
 
 sweep ::