diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -57,3 +57,7 @@
 ## 0.4.1.0 -- 2020-03-25
 
 * Fourth version revised A. Fixed issues with being not compiled for GHC 7.8.4 and for the wrong arguments specifying for 'adjustVolRes' function.
+
+## 0.4.2.0 -- 2020-03-25
+
+* Fourth version revised B. Fixed issue with wrongly specified interval to be adjusted with 'adjustVolRes' function.
diff --git a/MMSyn7l.hs b/MMSyn7l.hs
--- a/MMSyn7l.hs
+++ b/MMSyn7l.hs
@@ -176,8 +176,8 @@
         first2 = min (abs first1) (abs last1)
         last2 = max (abs first1) (abs last1)
         first = if compare first2 idxAllN == GT then 0 else first2
-        last =  if compare last2 idxAllN == GT then idxAllN else last2
-     ; V.mapM_ (changeVolume 1) (V.unsafeSlice first last dirV)
+        l =  if compare last2 idxAllN == GT then idxAllN - first + 1 else last2 - first + 1
+     ; V.mapM_ (changeVolume 1) (V.unsafeSlice first l dirV)
      ; putStrLn ""
      ; putStrLn "Now you have changed (or left unchanged) the amplitudes for the needed \"result*.wav\" sound files." }) (do
          error "Please, specify a right numbers for the first and last files to be adjusted starting count from 0.")
diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -50,7 +50,7 @@
       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: 0.4.0.0"
+      putStrLn "mmsyn7l version: 0.4.2.0"
       putStrLn ""
     ("-r":_)  -> adjustVolRes . drop 1 $ args
     _         ->  do
diff --git a/mmsyn7l.cabal b/mmsyn7l.cabal
--- a/mmsyn7l.cabal
+++ b/mmsyn7l.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                mmsyn7l
-version:             0.4.1.0
+version:             0.4.2.0
 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