Spectral Selection Toggle (using q key) by Paul Licameli.

src/TrackPanel.h

@@ -582,6 +582,15 @@ protected:
    double mFreqSelPin;
    const WaveTrack *mFreqSelTrack;
    std::auto_ptr<SpectrumAnalyst> mFrequencySnapper;
+
+   // For toggling of spectral seletion
+   double mLastF0;
+   double mLastF1;
+
+public:
+   void ToggleSpectralSelection();
+protected:
+
 #endif
 
    Track *mCapturedTrack;