Bug36, partial: Redraw mixer board when meter range preference changes

src/MixerBoard.h

@@ -78,6 +78,8 @@ public:
                      const wxSize& size = wxDefaultSize);
    virtual ~MixerTrackCluster() {}
 
+   void UpdatePrefs();
+
    void HandleResize(); // For wxSizeEvents, update gain slider and meter.
 
    void HandleSliderGain(const bool bWantPushState = false);
@@ -203,6 +205,8 @@ public:
                const wxSize& size = wxDefaultSize);
    virtual ~MixerBoard();
 
+   void UpdatePrefs();
+
    // Add clusters for any tracks we're not yet showing.
    // Update pointers for tracks we're aleady showing.
    void UpdateTrackClusters();