diff --git a/csound-catalog.cabal b/csound-catalog.cabal
--- a/csound-catalog.cabal
+++ b/csound-catalog.cabal
@@ -1,5 +1,5 @@
 Name:          csound-catalog
-Version:       0.2.0
+Version:       0.2.1
 Cabal-Version: >= 1.6
 License:       BSD3
 License-file:  LICENSE
@@ -27,7 +27,7 @@
 Library
   Ghc-Options:    -Wall
   Build-Depends:
-        base >= 4, base < 5, transformers >= 0.3, csound-expression >= 4.0.0
+        base >= 4, base < 5, transformers >= 0.3, csound-expression >= 4.3
   Hs-Source-Dirs:      src/
   Exposed-Modules:
         Csound.Catalog
diff --git a/src/Csound/Catalog/Effect.hs b/src/Csound/Catalog/Effect.hs
--- a/src/Csound/Catalog/Effect.hs
+++ b/src/Csound/Catalog/Effect.hs
@@ -141,7 +141,7 @@
 -- > sweepFilter dur startCps endCps bandWidth asignal
 loopSweepFilter :: D -> D -> D -> Sig -> Sig -> Sig
 loopSweepFilter dur start end bandWidth = bp centerFreq bandWidth
-    where centerFreq = oscLine start end (sig dur)
+    where centerFreq = loopseg [sig start, 1, sig end, 1, sig start] (1 / sig dur)
 
 -- | The effect that was used in the piece \"Bay at night\".
 bayAtNight :: Sig -> SE (Sig, Sig)
diff --git a/src/Csound/Catalog/Wave/Ac.hs b/src/Csound/Catalog/Wave/Ac.hs
--- a/src/Csound/Catalog/Wave/Ac.hs
+++ b/src/Csound/Catalog/Wave/Ac.hs
@@ -127,8 +127,8 @@
 xing :: D -> Sig -> Sig
 xing xdur cps = asignal
     where
-        amps xs dt vib freq phs = ar (loopseg (sig $ 1/xdur) 0 0 xs) * (1 + poscil vibEnv freq sine `withD` phs)
-            where vibEnv = ar $ loopseg (sig $ 1/xdur) 0 0 [0, dt, vib, sig xdur - dt, 0]
+        amps xs dt vib freq phs = ar (loopseg xs (sig $ 1/xdur)) * (1 + poscil vibEnv freq sine `withD` phs)
+            where vibEnv = ar $ loopseg [0, dt, vib, sig xdur - dt, 0] (sig $ 1/xdur)
 
         f vol freq = poscil vol (sig freq * cps) sine
 
@@ -166,8 +166,8 @@
         ishift      = 4 / 12000
         ipch        = cps
         ioct        = octcps cps
-        amodi       = ar $ loopseg (sig $ 1 / xdur) 0 0 [0, iattack, 5, sig xdur, 2, irelease, 0]
-        amodr       = ar $ loopseg (sig $ 0.5 / xdur) 0 0 [ip6, 1, ip7, 1, ip6]
+        amodi       = ar $ loopseg [0, iattack, 5, sig xdur, 2, irelease, 0] (sig $ 1 / xdur) 
+        amodr       = ar $ loopseg [ip6, 1, ip7, 1, ip6] (sig $ 0.5 / xdur) 
         a1          = amodi * (amodr - 1 / amodr) / 2
         a2          = amodi * (amodr + 1 / amodr) / 2
         a1ndx       = abs $ a1 / 10
@@ -185,7 +185,7 @@
 filteredChorus :: D -> Sig -> Sig
 filteredChorus xdur cps = asignal
     where 
-        a ~~ b = loopseg (sig $ 1 / (xdur * 2)) 0 0 [sig a, 1, sig b, 1, sig a]
+        a ~~ b = loopseg [sig a, 1, sig b, 1, sig a] (sig $ 1 / (xdur * 2))
         filt cf1 bw1 cf2 bw2 x = balance (bp cf2 bw2 $ bp cf1 bw1 x) x
         harm fqc = poscil ((sig $ idb)) fqc $ sines 
                             [ 0.28, 1, 0.74, 0.66, 0.78, 0.48, 0.05, 0.33, 0.12
@@ -268,7 +268,7 @@
 melody :: D -> Sig -> SE Sig
 melody xdur cps = do
     k1000 <- randi 1 10
-    let k100 = cps + loopseg (sig $ 1/xdur) 0 0 [0, 0.5, 1, sig xdur, 1] * poscil 1 (5 + k1000) sine
+    let k100 = cps + loopseg [0, 0.5, 1, sig xdur, 1] (sig $ 1/xdur) * poscil 1 (5 + k1000) sine
         -- a1-3 are for cheby with p6=1-4
         a1   = poscil k1 k100 (sines [1, 0.4, 0.2, 0.1, 0.1, 0.05])
         a2   = tablei a1 ip6 `withDs` [1, 0.5]
diff --git a/src/Csound/Catalog/Wave/Vowel.hs b/src/Csound/Catalog/Wave/Vowel.hs
--- a/src/Csound/Catalog/Wave/Vowel.hs
+++ b/src/Csound/Catalog/Wave/Vowel.hs
@@ -47,7 +47,7 @@
 loopVowels :: D -> Sig -> [(Vowel, D)] -> Sig -> Sig
 loopVowels maxDur xdur params = vowelsBy mkEnv maxDur params lastVowel
     where 
-        mkEnv xs x = loopseg (1 / xdur) 0 0 ((++ [sig x]) $ (\(a, b) -> [sig a, sig b]) =<< xs)
+        mkEnv xs x = loopseg ((++ [sig x]) $ (\(a, b) -> [sig a, sig b]) =<< xs) (1 / xdur)
         lastVowel = fst $ head params
 
 -- | Generic construcotr for the signals that interpolate between vowel sounds.