diff --git a/src/Temporal/Music/Notation/Pitch.hs b/src/Temporal/Music/Notation/Pitch.hs
--- a/src/Temporal/Music/Notation/Pitch.hs
+++ b/src/Temporal/Music/Notation/Pitch.hs
@@ -348,7 +348,7 @@
 
 -- | gives scale multiplier
 scaleStep :: Scale -> Int -> Interval
-scaleStep s x = (scaleOctave s ^ o) * scaleSteps s V.! n    
+scaleStep s x = (scaleOctave s ^^ o) * scaleSteps s V.! n    
     where (o, n) = divMod (x - c0) $ scaleSize s
           c0     = fst $ scaleBase s
           
diff --git a/src/Temporal/Music/Notation/Score.hs b/src/Temporal/Music/Notation/Score.hs
--- a/src/Temporal/Music/Notation/Score.hs
+++ b/src/Temporal/Music/Notation/Score.hs
@@ -23,7 +23,7 @@
     pedal, pedalBy,
     sustain, sustainBy,
     -- ** Mappings
-    tmap, dmap, tdmap, 
+    tmap, dmap, tdmap, eventMap,
     -- * Rendering
     Event(..),
     EventList(..),    
@@ -199,6 +199,21 @@
 tdmap :: (Time -> Dur -> a -> b) -> Score a -> Score b
 tdmap = M.tdmap
 
+
+-- | General mapping. In the end all values of type 'Score' 
+-- are to be converted to 'EventList' wich is list of 'Event' s 
+-- and function 'eventMap' allows mapping on 'Score' subvalues as if 
+-- they are events already.
+--
+-- Warning : It is possible to change start time position with 
+-- 'eventMap' but it can lead to unexpected outcome when used 
+-- with 'slice' function. 'slice' operates on structure of 
+-- type 'Score' (how value was built with 'sequent', 'parallel'
+-- or 'stretch' and other functions), but 'eventMap' operates 
+-- on 'Score' subvalues as if they are converted to 'Event' s 
+-- and some shifted events can slip through 'slice' 's fingers.
+eventMap :: (Event Dur a -> Event Dur b) -> Score a -> Score b
+eventMap = M.eventMap
 
 -- | relative 'tmap' 
 --
diff --git a/temporal-music-notation.cabal b/temporal-music-notation.cabal
--- a/temporal-music-notation.cabal
+++ b/temporal-music-notation.cabal
@@ -1,5 +1,5 @@
 Name:          temporal-music-notation
-Version:       0.1.4
+Version:       0.1.6
 Cabal-Version: >= 1.2
 License-file:  LICENSE
 License:       BSD3