diff --git a/src/main.cpp b/src/main.cpp
index fe87726..29f80b5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -192,7 +192,7 @@ void CVisualizationMatrix::Render()
   }
 }
 
-bool CVisualizationMatrix::Start(int iChannels, int iSamplesPerSec, int iBitsPerSample, std::string szSongName)
+bool CVisualizationMatrix::Start(int iChannels, int iSamplesPerSec, int iBitsPerSample, const std::string& szSongName)
 {
   kodi::Log(ADDON_LOG_DEBUG, "Start %i %i %i %s\n", iChannels, iSamplesPerSec, iBitsPerSample, szSongName.c_str());
 
@@ -229,7 +229,7 @@ void CVisualizationMatrix::Stop()
 }
 
 
-void CVisualizationMatrix::AudioData(const float* pAudioData, int iAudioDataLength, float* pFreqData, int iFreqDataLength)
+void CVisualizationMatrix::AudioData(const float* pAudioData, size_t iAudioDataLength)
 {
   WriteToBuffer(pAudioData, iAudioDataLength, 2);
 
@@ -332,7 +332,7 @@ bool CVisualizationMatrix::UpdateAlbumart()
   return CVisualizationMatrix::UpdateAlbumart(m_albumArt);
 }
 
-bool CVisualizationMatrix::UpdateAlbumart(std::string albumart)
+bool CVisualizationMatrix::UpdateAlbumart(const std::string& albumart)
 {
   m_albumArt = albumart;
 
diff --git a/src/main.h b/src/main.h
index 4e92f95..0556116 100644
--- a/src/main.h
+++ b/src/main.h
@@ -23,9 +23,9 @@ class ATTR_DLL_LOCAL CVisualizationMatrix
   CVisualizationMatrix();
   ~CVisualizationMatrix() override;
 
-  bool Start(int channels, int samplesPerSec, int bitsPerSample, std::string songName) override;
+  bool Start(int channels, int samplesPerSec, int bitsPerSample, const std::string& songName) override;
   void Stop() override;
-  void AudioData(const float* audioData, int audioDataLength, float* freqData, int freqDataLength) override;
+  void AudioData(const float* audioData, size_t audioDataLength) override;
   void Render() override;
   bool GetPresets(std::vector<std::string>& presets) override;
   int GetActivePreset() override;
@@ -33,7 +33,7 @@ class ATTR_DLL_LOCAL CVisualizationMatrix
   bool NextPreset() override;
   bool LoadPreset(int select) override;
   bool RandomPreset() override;
-  bool UpdateAlbumart(std::string albumart) override;
+  bool UpdateAlbumart(const std::string& albumart) override;
 
 private:
   void RenderTo(GLuint shader, GLuint effect_fb);
diff --git a/visualization.matrix/addon.xml.in b/visualization.matrix/addon.xml.in
index 859e7fc..b5b92d5 100644
--- a/visualization.matrix/addon.xml.in
+++ b/visualization.matrix/addon.xml.in
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <addon
   id="visualization.matrix"
-  version="20.1.0"
+  version="20.2.0"
   name="Matrix"
   provider-name="Sarbes">
   <requires>@ADDON_DEPENDS@</requires>
diff --git a/visualization.matrix/changelog.txt b/visualization.matrix/changelog.txt
index 86d7bbd..c4f2792 100644
--- a/visualization.matrix/changelog.txt
+++ b/visualization.matrix/changelog.txt
@@ -1,3 +1,6 @@
+20.2.0
+- Kodi visualization API update to version 4.0.0
+
 20.1.0
 - Translation updates by Weblate
 - Kodi main API update to version 2.0.0