diff --git a/src/Sound/Tidal/Core.hs b/src/Sound/Tidal/Core.hs
index 1eb1b1cfa..160dfa406 100644
--- a/src/Sound/Tidal/Core.hs
+++ b/src/Sound/Tidal/Core.hs
@@ -179,12 +179,12 @@ a |-  b = (-) <$> a <* b
 ( -|) :: Num a => Pattern a -> Pattern a -> Pattern a
 a  -| b = (-) <$> a *> b
 
-(|%|) :: (Applicative a, Real b) => a b -> a b -> a b
-a |%| b = mod' <$> a <*> b
-(|% ) :: Real a => Pattern a -> Pattern a -> Pattern a
-a |%  b = mod' <$> a <* b
-( %|) :: Real a => Pattern a -> Pattern a -> Pattern a
-a  %| b = mod' <$> a *> b
+(|%|) :: (Applicative a, Moddable b) => a b -> a b -> a b
+a |%| b = gmod <$> a <*> b
+(|% ) :: Moddable a => Pattern a -> Pattern a -> Pattern a
+a |%  b = gmod <$> a <* b
+( %|) :: Moddable a => Pattern a -> Pattern a -> Pattern a
+a  %| b = gmod <$> a *> b
 
 (|**|) :: (Applicative a, Floating b) => a b -> a b -> a b
 a |**| b = (**) <$> a <*> b
diff --git a/src/Sound/Tidal/Pattern.hs b/src/Sound/Tidal/Pattern.hs
index e7046abf2..f752f898c 100644
--- a/src/Sound/Tidal/Pattern.hs
+++ b/src/Sound/Tidal/Pattern.hs
@@ -40,6 +40,7 @@ import           Data.List (delete, findIndex, sort)
 import           Data.Word (Word8)
 import           Data.Data (Data) -- toConstr
 import           Data.Typeable (Typeable)
+import           Data.Fixed (mod')
 
 import           Sound.Tidal.Time
 
@@ -297,6 +298,20 @@ instance Fractional ValueMap where
   recip        = fmap (applyFIS recip id id)
   fromRational r = Map.singleton "speed" $ VF (fromRational r)
 
+class Moddable a where
+  gmod :: a -> a -> a
+
+instance Moddable Double where
+  gmod = mod'
+instance Moddable Rational where
+  gmod = mod'
+instance Moddable Note where
+  gmod (Note a) (Note b) = Note (mod' a b)
+instance Moddable Int where
+  gmod = mod
+instance Moddable ValueMap where
+  gmod = Map.unionWith (fNum2 mod mod')
+
 instance Floating ValueMap
   where pi = noOv "pi"
         exp _ = noOv "exp"
diff --git a/tidal-parse/src/Sound/Tidal/Parse.hs b/tidal-parse/src/Sound/Tidal/Parse.hs
index 8eea4b0bb..d828154dd 100644
--- a/tidal-parse/src/Sound/Tidal/Parse.hs
+++ b/tidal-parse/src/Sound/Tidal/Parse.hs
@@ -523,7 +523,7 @@ numMergeOperator =
   $(fromHaskell "*") <|>
   $(fromHaskell "-")
 
-realMergeOperator :: Real a => H (Pattern a -> Pattern a -> Pattern a)
+realMergeOperator :: T.Moddable a => H (Pattern a -> Pattern a -> Pattern a)
 realMergeOperator =
   $(fromTidal "|%|") <|>
   $(fromTidal "|%") <|>