diff --git a/src/soundbase.cpp b/src/soundbase.cpp
index 032659e3..6169e0d2 100755
--- a/src/soundbase.cpp
+++ b/src/soundbase.cpp
@@ -31,11 +31,11 @@ CSoundBase::CSoundBase ( const QString& strNewSystemDriverTechniqueName,
                          void           (*fpNewProcessCallback) ( CVector<int16_t>& psData, void* pParg ),
                          void*          pParg,
                          const int      iNewCtrlMIDIChannel ) :
-    fpProcessCallback ( fpNewProcessCallback ),
-    pProcessCallbackArg ( pParg ), bRun ( false ),
-    bIsCallbackAudioInterface ( bNewIsCallbackAudioInterface ),
+    fpProcessCallback            ( fpNewProcessCallback ),
+    pProcessCallbackArg          ( pParg ), bRun ( false ),
+    bIsCallbackAudioInterface    ( bNewIsCallbackAudioInterface ),
     strSystemDriverTechniqueName ( strNewSystemDriverTechniqueName ),
-    iCtrlMIDIChannel ( iNewCtrlMIDIChannel )
+    iCtrlMIDIChannel             ( iNewCtrlMIDIChannel )
 {
     // initializations for the sound card names (default)
     lNumDevs          = 1;
diff --git a/src/soundbase.h b/src/soundbase.h
index 381648f7..f11d434c 100755
--- a/src/soundbase.h
+++ b/src/soundbase.h
@@ -97,6 +97,27 @@ protected:
     virtual void     UnloadCurrentDriver() {}
     QVector<QString> LoadAndInitializeFirstValidDriver ( const bool bOpenDriverSetup = false );
 
+    static void GetSelCHAndAddCH ( const int iSelCH,    const int iNumInChan,
+                                   int&      iSelCHOut, int&      iSelAddCHOut )
+    {
+        // we have a mixed channel setup, definitions:
+        // - mixed channel setup only for 4 physical inputs:
+        //   SelCH == 4: Ch 0 + Ch 2
+        //   SelCh == 5: Ch 0 + Ch 3
+        //   SelCh == 6: Ch 1 + Ch 2
+        //   SelCh == 7: Ch 1 + Ch 3
+        if ( iSelCH >= iNumInChan )
+        {
+            iSelAddCHOut = ( ( iSelCH - iNumInChan ) % 2 ) + 2;
+            iSelCHOut    = ( iSelCH - iNumInChan ) / 2;
+        }
+        else
+        {
+            iSelAddCHOut = -1; // set it to an invalid number
+            iSelCHOut    = iSelCH;
+        }
+    }
+
     // function pointer to callback function
     void (*fpProcessCallback) ( CVector<int16_t>& psData, void* arg );
     void* pProcessCallbackArg;
diff --git a/windows/sound.h b/windows/sound.h
index 951acfcb..46e078e7 100755
--- a/windows/sound.h
+++ b/windows/sound.h
@@ -87,28 +87,6 @@ protected:
     bool             CheckSampleTypeSupportedForCHMixing ( const ASIOSampleType SamType );
     void             ResetChannelMapping();
 
-    static void GetSelCHAndAddCH ( const int iSelCH,    const int iNumInChan,
-                                   int&      iSelCHOut, int&      iSelAddCHOut )
-    {
-        // we have a mixed channel setup
-        // definitions:
-        // - mixed channel setup only for 4 physical inputs:
-        //   SelCH == 4: Ch 0 + Ch 2
-        //   SelCh == 5: Ch 0 + Ch 3
-        //   SelCh == 6: Ch 1 + Ch 2
-        //   SelCh == 7: Ch 1 + Ch 3
-        if ( iSelCH >= iNumInChan )
-        {
-            iSelAddCHOut = ( ( iSelCH - iNumInChan ) % 2 ) + 2;
-            iSelCHOut    = ( iSelCH - iNumInChan ) / 2;
-        }
-        else
-        {
-            iSelAddCHOut = -1;
-            iSelCHOut    = iSelCH;
-        }
-    }
-
     int              iASIOBufferSizeMono;
     int              iASIOBufferSizeStereo;