diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -95,3 +95,8 @@
 
 * Ninth version revised A. Removed two functions from DobutokO.Sound.Functional module because of their inefficient work that leads to very long
 (possibly infinitely) computation. 
+
+## 0.10.0.0 -- 2020-03-14
+
+* Tenth version. Added again the possibility to filter possible beats. Added new simple functions that are likely to work with previously prepared
+Vector (Double, Double) that satisfies some constraints. Some documentation imrovement. Some performance optimizations.
diff --git a/DobutokO/Sound/Functional.hs b/DobutokO/Sound/Functional.hs
--- a/DobutokO/Sound/Functional.hs
+++ b/DobutokO/Sound/Functional.hs
@@ -8,11 +8,18 @@
 -- A program and a library to create experimental music
 -- from a mono audio and a Ukrainian text.
 
+{-# LANGUAGE BangPatterns #-}
 {-# OPTIONS_GHC -threaded #-}
 
 module DobutokO.Sound.Functional (
   -- * Use additional function as a parameter
   oberSoXSynth2FDN
+  , oberSoXSynth2FDN_B
+  -- ** Just simple function application
+  , oberSoXSynth2FDN_S
+  -- *** With additional filtering
+  , oberSoXSynth2FDN_Sf
+  , oberSoXSynth2FDN_Sf3
 ) where
 
 import Numeric
@@ -32,26 +39,197 @@
 --
 -- Be aware that the result can be rather unpredictable (the program can even obtain segmentation fault) for not very suitable function.
 -- But for a lot of functions this works well.
-oberSoXSynth2FDN :: (Double -> V.Vector (Double, Double)) -> Double -> Double -> String -> IO ()
-oberSoXSynth2FDN f x y zs
+-- 
+-- It is recommended to fully compute the \"f\" function before using it in the 'oberSoXSynth2FDN'.
+oberSoXSynth2FDN :: (Double -> V.Vector (Double, Double)) -> (Double, Double) -> String -> IO ()
+oberSoXSynth2FDN f (x, y) zs
  | V.null . convertToProperUkrainian $ zs = oberSoXSynth x
  | otherwise = do
     let note0 = closestNote (if x /= 0.0 then abs x else V.unsafeIndex notes 0)
         note1 = dNote (V.unsafeIndex (intervalsFromString zs) 0) note0
-        g0    = V.fromList . nubBy (\(x1,_) (x2,_) -> x1 == x2) . V.toList . V.map (\(noteX, amplX) ->
+        g0    = V.fromList . nubBy (\(!x1,_) (!x2,_) -> x1 == x2) . V.toList . V.map (\(noteX, !amplX) ->
            if noteX <= 0.0 then (fromIntegral 2 * note0, abs (amplX - (fromIntegral . truncate $ amplX))) else (closestNote noteX,
              abs (amplX - (fromIntegral . truncate $ amplX)))) . f
-        g k   = V.takeWhile (\w -> compare (fst w) (V.unsafeIndex notes 107) /= GT && compare (snd w) 0.001 == GT) .
-                   V.imap (\i (noteY,z0) -> (fromIntegral (i + 1) * (fst . V.unsafeIndex (g0 k) $ 0), z0)) . g0 $ k 
+        g k   = V.takeWhile (\(!w,!z) -> compare w (V.unsafeIndex notes 107) /= GT && compare (abs z) 0.001 == GT) .
+                   V.imap (\i (_,!z0) -> (fromIntegral (i + 1) * (fst . V.unsafeIndex (g0 k) $ 0), z0)) . g0 $ k 
         v0    = g note0
         v1    = if isNothing note1 then V.empty
                 else g . fromJust $ note1
-        oberSoXSynthHelp vec = V.imapM_ (\i (noteN, amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
-          ["-r22050", "-n", "test0" ++ show (i + 2) ++ ".wav", "synth", showFFloat (Just 4) y $ show 0,"sine", showFFloat (Just 4) noteN $ show 0,
-            "vol", showFFloat (Just 4) amplN $ show 0] "") vec
-        oberSoXSynthHelp2 vec = V.imapM_ (\i (noteN, amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
-          ["-r22050", "-n", "test1" ++ show (i + 2) ++ ".wav", "synth", showFFloat (Just 4) y $ show 0,"sine", showFFloat (Just 4) noteN $ show 0,
-            "vol", showFFloat (Just 4) amplN $ show 0] "") vec
+        ts = showFFloat (Just 4) y $ show 0 
+        oberSoXSynthHelp vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test0" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+        oberSoXSynthHelp2 vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test1" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+    _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testA.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
+       showFFloat (Just 4) note0 $ show 0] ""
+    if isNothing note1 then do
+      oberSoXSynthHelp v0
+    else do 
+      _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testB.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
+         showFFloat (Just 4) (fromJust note1) $ show 0] ""
+      oberSoXSynthHelp v0
+      oberSoXSynthHelp2 v1
+    paths0 <- listDirectory "."
+    let paths = sort . filter (isPrefixOf "test") $ paths0
+    _ <- readProcessWithExitCode (fromJust (showE "sox")) (["--combine", "mix"] ++ paths ++ ["result.wav","vol","0.3"]) ""
+    mapM_ removeFile paths
+
+-- | Similar to 'oberSoXSynth2DN' but instead of 'oberTones' function, it uses volatile function @f::Double -> Vector (Double, Double)@ with
+-- somewhat sophisticated mechanism to normalize the resulting 'V.Vector' elements @(Double, Double)@. The last one is experimental feature, so
+-- it is your responsibility to provide a function so that it does not lead to clipping. In such a case, the result of application of the
+-- 'convertToProperUkrainian' to the 'String' parameter must not be 'V.empty'.
+--
+-- Be aware that the result can be rather unpredictable (the program can even obtain segmentation fault) for not very suitable function.
+-- But for a lot of functions this works well.
+-- 
+-- It is recommended to fully compute the \"f\" function before using it in the 'oberSoXSynth2FDN'.
+oberSoXSynth2FDN_B :: (Double -> V.Vector (Double, Double)) -> (Double, Double, Double) -> String -> IO ()
+oberSoXSynth2FDN_B f (x, y, limB) zs
+ | V.null . convertToProperUkrainian $ zs = oberSoXSynth x
+ | otherwise = do
+    let limA0 = abs ((limB / fromIntegral 10) - (fromIntegral . truncate $ (limB / fromIntegral 10))) * fromIntegral 10
+        limA  = if compare limA0 0.1 == LT then 0.1 else limA0
+        note0 = closestNote (if x /= 0.0 then abs x else V.unsafeIndex notes 0)
+        note1 = dNote (V.unsafeIndex (intervalsFromString zs) 0) note0
+        g0    = V.fromList . nubBy (\(!x1,_) (!x2,_) -> compare (abs (x1 - x2)) limA == LT) . V.toList . V.map (\(noteX, !amplX) ->
+           if noteX <= 0.0 then (fromIntegral 2 * note0, abs (amplX - (fromIntegral . truncate $ amplX))) else (closestNote noteX,
+             abs (amplX - (fromIntegral . truncate $ amplX)))) . f
+        g k   = V.takeWhile (\(!w,!z) -> compare w (V.unsafeIndex notes 107) /= GT && compare (abs z) 0.001 == GT) .
+                   V.imap (\i (_,!z0) -> (fromIntegral (i + 1) * (fst . V.unsafeIndex (g0 k) $ 0), z0)) . g0 $ k 
+        v0    = g note0
+        v1    = if isNothing note1 then V.empty
+                else g . fromJust $ note1
+        ts = showFFloat (Just 4) y $ show 0 
+        oberSoXSynthHelp vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, !amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test0" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+        oberSoXSynthHelp2 vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, !amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test1" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+    _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testA.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
+       showFFloat (Just 4) note0 $ show 0] ""
+    if isNothing note1 then do
+      oberSoXSynthHelp v0
+    else do 
+      _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testB.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
+         showFFloat (Just 4) (fromJust note1) $ show 0] ""
+      oberSoXSynthHelp v0
+      oberSoXSynthHelp2 v1
+    paths0 <- listDirectory "."
+    let paths = sort . filter (isPrefixOf "test") $ paths0
+    _ <- readProcessWithExitCode (fromJust (showE "sox")) (["--combine", "mix"] ++ paths ++ ["result.wav","vol","0.3"]) ""
+    mapM_ removeFile paths    
+
+-- | Similar to 'oberSoXSynth2FDN' but it does not make any normalizing transformations with the 'V.Vector' argument. To be used properly, it is needed
+-- that every second element in the tuple in the 'V.Vector' argument must be in the range [-1.0..1.0] and every first element must be in between
+-- 16.351597831287414 and 7902.132820097988 (Hz).
+--
+-- Be aware that the result can be rather unpredictable (the program can even obtain segmentation fault) for not very suitable function.
+-- But for a lot of functions this works well.
+-- 
+-- It is recommended to fully compute the \"f\" function before using it in the 'oberSoXSynth2FDN_S'.
+oberSoXSynth2FDN_S :: (Double -> V.Vector (Double, Double)) -> (Double, Double) -> String -> IO ()
+oberSoXSynth2FDN_S f (x, y) zs
+ | V.null . convertToProperUkrainian $ zs = oberSoXSynth x
+ | otherwise = do
+    let note0 = closestNote (if x /= 0.0 then abs x else V.unsafeIndex notes 0)
+        note1 = dNote (V.unsafeIndex (intervalsFromString zs) 0) note0
+        v0    = f note0
+        v1    = if isNothing note1 then V.empty
+                else f . fromJust $ note1
+        ts = showFFloat (Just 4) y $ show 0 
+        oberSoXSynthHelp vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, !amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test0" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+        oberSoXSynthHelp2 vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, !amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test1" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+    _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testA.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
+       showFFloat (Just 4) note0 $ show 0] ""
+    if isNothing note1 then do
+      oberSoXSynthHelp v0
+    else do 
+      _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testB.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
+         showFFloat (Just 4) (fromJust note1) $ show 0] ""
+      oberSoXSynthHelp v0
+      oberSoXSynthHelp2 v1
+    paths0 <- listDirectory "."
+    let paths = sort . filter (isPrefixOf "test") $ paths0
+    _ <- readProcessWithExitCode (fromJust (showE "sox")) (["--combine", "mix"] ++ paths ++ ["result.wav","vol","0.3"]) ""
+    mapM_ removeFile paths
+
+-- | Similar to 'oberSoXSynth2FDN_S' but additionally the program filters out from the resulting 'V.Vector' after \"f\" application values that are smaller
+-- by absolute value than 0.001.
+--
+-- Be aware that the result can be rather unpredictable (the program can even obtain segmentation fault) for not very suitable function.
+-- But for a lot of functions this works well.
+-- 
+-- It is recommended to fully compute the \"f\" function before using it in the 'oberSoXSynth2FDN_S'.
+oberSoXSynth2FDN_Sf :: (Double -> V.Vector (Double, Double)) -> (Double, Double) -> String -> IO ()
+oberSoXSynth2FDN_Sf f (x, y) zs
+ | V.null . convertToProperUkrainian $ zs = oberSoXSynth x
+ | otherwise = do
+    let note0 = closestNote (if x /= 0.0 then abs x else V.unsafeIndex notes 0)
+        note1 = dNote (V.unsafeIndex (intervalsFromString zs) 0) note0
+        v0    = V.filter (\(_,!z) -> compare (abs z) 0.001 == GT) . f $ note0
+        v1    = if isNothing note1 then V.empty
+                else V.filter (\(_,!z) -> compare z 0.001 == GT) . f . fromJust $ note1
+        ts = showFFloat (Just 4) y $ show 0 
+        oberSoXSynthHelp vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, !amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test0" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+        oberSoXSynthHelp2 vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, !amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test1" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+    _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testA.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
+       showFFloat (Just 4) note0 $ show 0] ""
+    if isNothing note1 then do
+      oberSoXSynthHelp v0
+    else do 
+      _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testB.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
+         showFFloat (Just 4) (fromJust note1) $ show 0] ""
+      oberSoXSynthHelp v0
+      oberSoXSynthHelp2 v1
+    paths0 <- listDirectory "."
+    let paths = sort . filter (isPrefixOf "test") $ paths0
+    _ <- readProcessWithExitCode (fromJust (showE "sox")) (["--combine", "mix"] ++ paths ++ ["result.wav","vol","0.3"]) ""
+    mapM_ removeFile paths
+
+-- | Similar to 'oberSoXSynth2FDN_S' but additionally the program filters out from the resulting 'V.Vector' after \"f\" application values that are smaller
+-- than the third 'Double' parameter by an absolute value in the triple of @Double@'s. 
+--
+-- Be aware that the result can be rather unpredictable (the program can even obtain segmentation fault) for not very suitable function.
+-- But for a lot of functions this works well.
+-- 
+-- It is recommended to fully compute the \"f\" function before using it in the 'oberSoXSynth2FDN_S'.
+oberSoXSynth2FDN_Sf3 :: (Double -> V.Vector (Double, Double)) -> (Double, Double, Double) -> String -> IO ()
+oberSoXSynth2FDN_Sf3 f (x, y, t0) zs
+ | V.null . convertToProperUkrainian $ zs = oberSoXSynth x
+ | otherwise = do
+    let note0 = closestNote (if x /= 0.0 then abs x else V.unsafeIndex notes 0)
+        note1 = dNote (V.unsafeIndex (intervalsFromString zs) 0) note0
+        v0    = V.filter (\(_,!z) -> compare (abs z) t0 == GT) . f $ note0
+        v1    = if isNothing note1 then V.empty
+                else V.filter (\(_,!z) -> compare (abs z) t0 == GT) . f . fromJust $ note1
+        ts = showFFloat (Just 4) y $ show 0 
+        oberSoXSynthHelp vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, !amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test0" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
+        oberSoXSynthHelp2 vec =
+          let l  = V.length vec in V.imapM_ (\i (noteN, !amplN) -> readProcessWithExitCode (fromJust (showE "sox"))
+            ["-r22050", "-n", "test1" ++ show (i + 2) ++ ".wav", "synth", ts,"sine", showFFloat (Just 4) noteN $ show 0,
+              "vol", showFFloat (Just 4) (amplN / fromIntegral l) $ show 0] "") vec
     _ <- readProcessWithExitCode (fromJust (showE "sox")) ["-r22050", "-n", "testA.wav", "synth", showFFloat (Just 4) y $ show 0,"sine",
        showFFloat (Just 4) note0 $ show 0] ""
     if isNothing note1 then do
diff --git a/dobutokO2.cabal b/dobutokO2.cabal
--- a/dobutokO2.cabal
+++ b/dobutokO2.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                dobutokO2
-version:             0.9.1.0
+version:             0.10.0.0
 synopsis:            A program and a library to create experimental music from a mono audio and a Ukrainian text
 description:         It can also create a timbre for the notes
 homepage:            https://hackage.haskell.org/package/dobutokO2