diff --git a/music-dynamics.cabal b/music-dynamics.cabal
--- a/music-dynamics.cabal
+++ b/music-dynamics.cabal
@@ -1,6 +1,6 @@
 
 name:                   music-dynamics
-version:                1.7.1
+version:                1.7.2
 author:                 Hans Hoglund
 maintainer:             Hans Hoglund
 license:                BSD3
@@ -20,14 +20,12 @@
   type:             git
   location:         git://github.com/music-suite/music-dynamics.git
 
-
 library
     build-depends:      base                    >= 4 && < 5,
-                        time,
-                        random,
+                        average                 >= 0.6 && < 1,
                         semigroups              >= 0.13.0.1 && < 1,
                         semigroupoids,
-                        music-dynamics-literal  == 1.7.1
+                        music-dynamics-literal  == 1.7.2
     exposed-modules:    Music.Dynamics
                         Music.Dynamics.Absolute
                         Music.Dynamics.Common
diff --git a/src/Music/Dynamics.hs b/src/Music/Dynamics.hs
--- a/src/Music/Dynamics.hs
+++ b/src/Music/Dynamics.hs
@@ -9,7 +9,7 @@
 -- Stability   : experimental
 -- Portability : portable
 --
--- Provides overloaded pitch literals.
+-- Provides various representation of musical dynamics.
 --
 -------------------------------------------------------------------------------------
 
@@ -51,3 +51,5 @@
 
     Nakamura (1987) The communication of dynamics between musicians and listeners through musical performance
 -}
+
+
diff --git a/src/Music/Dynamics/Balance.hs b/src/Music/Dynamics/Balance.hs
--- a/src/Music/Dynamics/Balance.hs
+++ b/src/Music/Dynamics/Balance.hs
@@ -9,7 +9,7 @@
 -- Stability   : experimental
 -- Portability : portable
 --
--- Provides overloaded pitch literals.
+-- Provides Balances, i.e. mappings from relative to absolute dynamics.
 --
 -------------------------------------------------------------------------------------
 
diff --git a/src/Music/Dynamics/Common.hs b/src/Music/Dynamics/Common.hs
--- a/src/Music/Dynamics/Common.hs
+++ b/src/Music/Dynamics/Common.hs
@@ -9,12 +9,13 @@
 -- Stability   : experimental
 -- Portability : portable
 --
--- Provides overloaded pitch literals.
+-- Provides relative dynamics.
 --
 -------------------------------------------------------------------------------------
 
-module Music.Dynamics.Common -- (
--- )
+module Music.Dynamics.Common (
+  Dynamics,
+)
 where
 
 import Data.Maybe
@@ -22,4 +23,6 @@
 import Data.Semigroup
 import Control.Monad
 import Control.Applicative
+import Data.Monoid.Average
 
+type Dynamics = Average Double