diff --git a/C.wav b/C.wav
Binary files a/C.wav and b/C.wav differ
diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -22,3 +22,7 @@
 ## 0.3.0.1 -- 2019-11-28
 
 * Third version revised A. Fixed an issue with the bounds for the library in the .cabal file.
+
+## 0.3.1.0 -- 2019-11-29
+
+* Third version revised B. Changed some sounds or sound representation: "и", "й", "в", "ь", "ць".
diff --git a/K.wav b/K.wav
Binary files a/K.wav and b/K.wav differ
diff --git a/L.wav b/L.wav
Binary files a/L.wav and b/L.wav differ
diff --git a/Z.wav b/Z.wav
Binary files a/Z.wav and b/Z.wav differ
diff --git a/d.wav b/d.wav
Binary files a/d.wav and b/d.wav differ
diff --git a/mmsyn6ukr.cabal b/mmsyn6ukr.cabal
--- a/mmsyn6ukr.cabal
+++ b/mmsyn6ukr.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                mmsyn6ukr
-version:             0.3.0.1
+version:             0.3.1.0
 synopsis:            Can be used as a musical instrument synthesizer or for Ukrainian language listening
 description:         A program that can be used as a musical instrument synthesizer or for Ukrainian speech synthesis especially for poets and writers
 homepage:            https://hackage.haskell.org/package/mmsyn6ukr
