diff --git a/Data/ZoomCache/Write.hs b/Data/ZoomCache/Write.hs
--- a/Data/ZoomCache/Write.hs
+++ b/Data/ZoomCache/Write.hs
@@ -35,7 +35,6 @@
 
     -- * TrackSpec helpers
     , oneTrack
-    , oneTrackVariable
 ) where
 
 import Blaze.ByteString.Builder hiding (flush)
@@ -178,15 +177,9 @@
             where
                 trackState = mkTrackState spec (TS 0) 1024
 
--- | Create a track map for a single constant-rate stream of a given type,
--- as track no. 1
-oneTrack :: TrackType -> Rational -> L.ByteString -> TrackMap
-oneTrack ztype rate name = IM.singleton 1 (TrackSpec ztype ConstantDR rate name)
-
--- | Create a track map for a single variable-rate stream of a given type,
--- as track no. 1
-oneTrackVariable :: TrackType -> L.ByteString -> TrackMap
-oneTrackVariable ztype name = IM.singleton 1 (TrackSpec ztype VariableDR 0 name)
+-- | Create a track map for a stream of a given type, as track no. 1
+oneTrack :: TrackType -> DataRateType -> Rational -> L.ByteString -> TrackMap
+oneTrack zType drType rate name = IM.singleton 1 (TrackSpec zType drType rate name)
 
 -- | Query the maximum number of data points to buffer for a given track before
 -- forcing a flush of all buffered data and summaries.
diff --git a/tools/zoom-cache.hs b/tools/zoom-cache.hs
--- a/tools/zoom-cache.hs
+++ b/tools/zoom-cache.hs
@@ -119,10 +119,10 @@
     w :: (ZoomWrite a, ZoomWrite (TimeStamp, a))
       => TrackType -> [a] -> FilePath -> IO ()
     w ztype d
-        | variable  = withFileWrite (oneTrackVariable ztype label)
+        | variable  = withFileWrite (oneTrack ztype VariableDR rate' label)
                           (not noRaw)
                           (sW >> mapM_ (write 1) (zip (map TS [1,3..]) d))
-        | otherwise = withFileWrite (oneTrack ztype rate' label)
+        | otherwise = withFileWrite (oneTrack ztype ConstantDR rate' label)
                           (not noRaw)
                           (sW >> mapM_ (write 1) d)
     rate' = fromInteger rate
diff --git a/zoom-cache.cabal b/zoom-cache.cabal
--- a/zoom-cache.cabal
+++ b/zoom-cache.cabal
@@ -7,7 +7,7 @@
 -- The package version. See the Haskell package versioning policy
 -- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
 -- standards guiding when and how versions should be incremented.
-Version:             0.1.0.2
+Version:             0.2.0.0
 
 -- A short (one-line) description of the package.
 Synopsis:            A streamable, seekable, zoomable cache file format
@@ -76,7 +76,7 @@
                        bytestring,
                        containers,
                        data-default,
-                       iteratee >= 0.8.0,
+                       iteratee >= 0.8.6.0,
                        MonadCatchIO-transformers,
                        mtl >= 2.0.0.0 && < 3,
                        ui-command