diff --git a/src/client.h b/src/client.h
index 82564975..f591db71 100755
--- a/src/client.h
+++ b/src/client.h
@@ -218,6 +218,11 @@ public:
     CVector<QString>        vstrIPAddress;
     QString                 strName;
 
+#ifdef LLCON_VST_PLUGIN
+    // VST version must have direct access to sound object
+    CSound* GetSound() { return &Sound; }
+#endif
+
 protected:
     // callback function must be static, otherwise it does not work
     static void  AudioCallback ( CVector<short>& psData, void* arg );
diff --git a/src/vstmain.cpp b/src/vstmain.cpp
index b4b476dd..fef50e58 100755
--- a/src/vstmain.cpp
+++ b/src/vstmain.cpp
@@ -84,9 +84,8 @@ void CLlconVST::processReplacing ( float**  pvIn,
     // check if client is running, if not, start it
     if ( !Client.IsRunning() )
     {
-
-// TODO set iNumSamples in Sound class somehow
-
+        // set buffer size and start
+        Client.GetSound()->SetMonoBufferSize ( iNumSamples );
         Client.Start();
     }
 
@@ -99,23 +98,18 @@ void CLlconVST::processReplacing ( float**  pvIn,
     // copy input data
     for ( i = 0, j = 0; i < iNumSamples; i++, j += 2 )
     {
-/*
-        pSound->vecsTmpAudioSndCrdStereo[j]     = pfIn0[i];
-        pSound->vecsTmpAudioSndCrdStereo[j + 1] = pfIn1[i];
-*/
+        (*Client.GetSound()->GetBuffer())[j]     = pfIn0[i];
+        (*Client.GetSound()->GetBuffer())[j + 1] = pfIn1[i];
     }
 
-/*
     // call processing callback function
-    pSound->ProcessCallback ( pSound->vecsTmpAudioSndCrdStereo );
-*/
+    Client.GetSound()->VSTProcessCallback (
+        *Client.GetSound()->GetBuffer() );
 
     // copy output data
     for ( i = 0, j = 0; i < iNumSamples; i++, j += 2 )
     {
-/*
-        pfOut0[i] = pSound->vecsTmpAudioSndCrdStereo[j];
-        pfOut1[i] = pSound->vecsTmpAudioSndCrdStereo[j + 1];
-*/
+        pfOut0[i] = (*Client.GetSound()->GetBuffer())[j];
+        pfOut1[i] = (*Client.GetSound()->GetBuffer())[j + 1];
     }
 }
diff --git a/src/vstsound.h b/src/vstsound.h
index b018c9ae..f2af3a04 100755
--- a/src/vstsound.h
+++ b/src/vstsound.h
@@ -35,23 +35,27 @@ class CSound : public CSoundBase
 {
 public:
     CSound ( void (*fpNewCallback) ( CVector<int16_t>& psData, void* arg ), void* arg ) :
-        CSoundBase ( true, fpNewCallback, arg )
-    {
-        // TODO
-    }
+      CSoundBase ( true, fpNewCallback, arg ), iVSTMonoBufferSize ( 0 ) {}
+
     virtual ~CSound() {}
 
-    virtual int Init ( const int iNewPrefMonoBufferSize )
+    // special VST functions
+    void SetMonoBufferSize ( const int iNVBS ) { iVSTMonoBufferSize = iNVBS; }
+    CVector<int16_t>* GetBuffer() { return &vecsAudioSndCrdStereo; }
+    void VSTProcessCallback ( CVector<int16_t>& psData )
     {
-        // TODO we have to query the current VST frame size somehow
-
-const int iVSTMonoBufferSize = iNewPrefMonoBufferSize;
+        CSoundBase::ProcessCallback ( psData );
+    }
 
+    virtual int Init ( const int )
+    {
         // init base class
         CSoundBase::Init ( iVSTMonoBufferSize );
-
         return iVSTMonoBufferSize;
     }
+
+protected:
+    int iVSTMonoBufferSize;
 };
 
 #endif // !defined ( _VSTSOUND_H__9518A346345768_11D3_8C0D_EEBF182CF549__INCLUDED_ )