diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,6 @@
 
 * Second version revised C. Fixed an issue with the wrong dependency mmsyn7ukr>=0.6.2.1.
 
-
-
+## 0.3.0.0 -- 2020-01-28
 
+* Third version. Changed the dependency bounds. Added the support for informational messages. Some documentation improvements.
diff --git a/MMSyn7l.hs b/MMSyn7l.hs
--- a/MMSyn7l.hs
+++ b/MMSyn7l.hs
@@ -3,6 +3,7 @@
 -- Copyright   :  (c) OleksandrZhabenko 2020
 -- License     :  MIT
 --
+-- Stability   :  Experimental
 -- Maintainer  :  olexandr543@yahoo.com
 --
 -- A program and a library to modify the amplitude of the sound representations for 
@@ -12,8 +13,8 @@
 module MMSyn7l where
 
 import Data.Char (toUpper, isDigit)
-import System.Directory
-import SoXBasics
+import qualified SoXBasics as SB
+import qualified SoXBasics1 as SB1
 import qualified Data.Vector as V
 import Control.Exception (onException)
 import CaseBi (getBFst')
@@ -51,7 +52,7 @@
 -- and so on.
 changeVolume :: FilePath -> IO ()
 changeVolume file = do
-  playA file
+  SB.playA file
   let sound = getBFst' ("е", V.fromList . zip ["A.wav", "B.wav", "C.wav", "D.wav", "E.wav", "F.wav", "G.wav", "H.wav", 
         "I.wav", "J.wav", "K.wav", "L.wav", "M.wav", "N.wav", "O.wav", "P.wav", "Q.wav", "R.wav", 
           "S.wav", "T.wav", "U.wav", "V.wav", "W.wav", "X.wav", "Y.wav", "Z.wav", "a.wav", "b.wav", "c.wav", 
@@ -100,8 +101,8 @@
 specifyVol :: FilePath -> IO ()
 specifyVol file = do   
   change0 <- getLine
-  upperbound <- upperBnd file
-  (originalStr, bool) <- selMaxAbs file (0::Int, upperbound)
+  upperbound <- SB.upperBnd file
+  (originalStr, bool) <- SB.selMaxAbs file (0::Int, upperbound)
   if bool 
     then changeVol3 file (change0, originalStr)
     else changeVol4 file (change0, originalStr)
@@ -112,10 +113,8 @@
   let ys = take 4 . filter isDigit $ xs
       coefA = 0.0001 * fromIntegral (read ys::Int)
       ratio = 1.0 - coefA
-  volS file (ratio * ampl)
-  removeFile file
-  renameFile ("8." ++ file) file
-
+  SB1.volS file (ratio * ampl)
+  
 -- | Function 'changeVol3' is used internally in the 'specifyVol' in case of working with the maximum amplitude.
 changeVol3 :: FilePath -> (String, String) -> IO ()
 changeVol3 file (change0, originalStr) = do
@@ -130,10 +129,8 @@
           let ys = take 4 . takeWhile (isDigit) $ xs
               coefA = 0.0001 * fromIntegral (read ys::Int)
               ratio = 1.0 + (delta / ampl) * coefA
-          volS file (ratio * ampl)
-          removeFile file
-          renameFile ("8." ++ file) file
-    else error "SoXBasics: the volS function gave a strange result!"
+          SB1.volS file (ratio * ampl)
+    else error "SoXBasics1: the volS function gave a strange result!"
 
 -- | Function 'changeVol4' is used internally in the 'specifyVol' in case of working with the minimum amplitude.
 changeVol4 :: FilePath -> (String, String) -> IO ()
@@ -149,8 +146,6 @@
           let ys = take 4 . filter isDigit $ xs
               coefA = 0.0001 * fromIntegral (read ys::Int)
               ratio = 1.0 + (delta / ampl) * coefA
-          volS file (ratio * ampl)
-          removeFile file
-          renameFile ("8." ++ file) file
-    else error "SoXBasic: the volS function gave a strange result!"
+          SB1.volS file (ratio * ampl)
+    else error "SoXBasics1: the volS function gave a strange result!"
       
diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -3,6 +3,7 @@
 -- Copyright   :  (c) OleksandrZhabenko 2020
 -- License     :  MIT
 --
+-- Stability   :  Experimental
 -- Maintainer  :  olexandr543@yahoo.com
 --
 -- A program and a library to modify the amplitudes of the sound representations for 
@@ -22,8 +23,8 @@
 main :: IO ()
 main = do
   args <- getArgs
-  if null args
-    then do
+  case args of
+    [] -> do
       putStrLn "Now you can change the amplitude of the sound representations of the Ukrainian sounds (or something similar). "
       putStrLn ""
       mapM_ changeVolume ["A.wav", "B.wav", "C.wav", "D.wav", "E.wav", "F.wav", "G.wav", "H.wav", 
@@ -33,7 +34,20 @@
       putStrLn ""
       putStrLn "Now you have changed (or left unchanged) the amplitudes for the sound representations for Ukrainian language. "
       putStrLn "Please, remember about responsible usage especially in case of processing the real voice sound samples! "
-    else do
+    ("-h":_)  -> do
+      putStrLn "SYNOPSYS: "
+      putStrLn "mmsyn7l -h    OR"
+      putStrLn "mmsyn7l -v    OR"
+      putStrLn "mmsyn7l [list-of-needed-sounds-to-be-amplitude-modified]"
+      putStrLn "\"-h\" prints this message."
+      putStrLn "\"-v\" prints version number of the program."
+      putStr "[list-of-needed-sounds-to-be-amplitude-modified (if given) -- the program modifies the amplitudes in the interactive mode only for the "
+      putStrLn "given sound representations. If not specified, the program modifies the amplitudes for all non-pause Ukrainian sounds representations."
+      putStrLn ""
+    ("-v":_)  -> do
+      putStrLn "mmsyn7l version: 0.3.0.0"
+      putStrLn ""
+    _         ->  do
       putStrLn "Now you can change the amplitude of the needed sound representations of the Ukrainian sounds (or something similar). "
       putStrLn ""
       let xs = take 1 $ args
diff --git a/README b/README
--- a/README
+++ b/README
@@ -30,8 +30,15 @@
 and so on.
 
          ***** Command Line Argument ***** 
-If you specify a command line argument, it must be a sorted list 
-of the Ukrainian sounds representations, which can be obtained by 
-using the mmsyn7s package. For more information, please, refer to:
-https://hackage.haskell.org/package/mmsyn7s
+If you specify a command line argument (other than "-h" or "-v"),
+it must be a sorted list of the Ukrainian sounds representations,
+which can be obtained by using the mmsyn7s package. For more information,
+please, refer to: https://hackage.haskell.org/package/mmsyn7s
+In such a case, the program will modify only the amplitudes for
+those Ukrainian sounds representations, which are in the list.
+Otherwise, the program will modify the amplitudes for all non-silent Ukrainian
+sounds representations in the current directory.
+
+The "-h" command line argument is used for the help informational message.
+The "-v" command line argument is used for the version number.
 
diff --git a/mmsyn7l.cabal b/mmsyn7l.cabal
--- a/mmsyn7l.cabal
+++ b/mmsyn7l.cabal
@@ -2,9 +2,9 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                mmsyn7l
-version:             0.2.3.0
-synopsis:            Modifies the amplitude of the sound representations for the Ukrainian language created by mmsyn7ukr package.
-description:         A program and a library to modify the amplitude of the sound representations for the Ukrainian language created by mmsyn7ukr package or somehow otherwise.
+version:             0.3.0.0
+synopsis:            Modifies the amplitudes of the Ukrainian sounds representations created by mmsyn7ukr package.
+description:         A program and a library to modify the amplitudes of the Ukrainian sounds representations created by mmsyn7ukr package or somehow otherwise.
 homepage:            https://hackage.haskell.org/package/mmsyn7l
 license:             MIT
 license-file:        LICENSE
@@ -20,7 +20,7 @@
   exposed-modules:     Main, MMSyn7l
   -- other-modules:
   -- other-extensions:
-  build-depends:       base >=4.7 && <4.14, directory >=1 && <1.5, mmsyn7ukr >=0.6.3 && <1, vector >=0.11 && <0.14, mmsyn2 >=0.1.7 && <1
+  build-depends:       base >=4.7 && <4.14, mmsyn7ukr >=0.10 && <1, vector >=0.11 && <0.14, mmsyn2 >=0.1.7 && <1
   -- hs-source-dirs:
   default-language:    Haskell2010
 
@@ -28,6 +28,6 @@
   main-is:             Main.hs
   -- other-modules:
   -- other-extensions:
-  build-depends:       base >=4.7 && <4.14, directory >=1 && <1.5, mmsyn7ukr >=0.6.3 && <1, vector >=0.11 && <0.14, mmsyn2 >=0.1.7 && <1
+  build-depends:       base >=4.7 && <4.14, mmsyn7ukr >=0.10 && <1, vector >=0.11 && <0.14, mmsyn2 >=0.1.7 && <1
   -- hs-source-dirs:
   default-language:    Haskell2010