diff --git a/spectrogramplot.cpp b/spectrogramplot.cpp
index 21ee948..7bee274 100644
--- a/spectrogramplot.cpp
+++ b/spectrogramplot.cpp
@@ -34,7 +34,6 @@
 
 SpectrogramPlot::SpectrogramPlot(std::shared_ptr<SampleSource<std::complex<float>>> src) : Plot(src), inputSource(src), tuner(this)
 {
-    sampleRate = 8000000;
     setFFTSize(512);
     zoomLevel = 0;
     powerMax = 0.0f;
@@ -153,6 +152,11 @@ void SpectrogramPlot::getLine(float *dest, off_t sample)
     }
 }
 
+int SpectrogramPlot::getStride()
+{
+    return fftSize / zoomLevel;
+}
+
 float SpectrogramPlot::getTunerCentre()
 {
     return 0.5f - tuner.centre() / (float)fftSize;
@@ -164,6 +168,11 @@ std::vector<float> SpectrogramPlot::getTunerTaps()
     return gr::filter::firdes::low_pass(1.0, 1.0, cutoff, cutoff / 2);
 }
 
+int SpectrogramPlot::linesPerTile()
+{
+    return tileSize / fftSize;
+}
+
 bool SpectrogramPlot::mouseEvent(QEvent::Type type, QMouseEvent event)
 {
     return tuner.mouseEvent(type, event);
@@ -174,11 +183,6 @@ std::shared_ptr<AbstractSampleSource> SpectrogramPlot::output()
     return tunerOutput;
 }
 
-void SpectrogramPlot::setSampleRate(int rate)
-{
-    sampleRate = rate;
-}
-
 void SpectrogramPlot::setFFTSize(int size)
 {
     fftSize = size;
@@ -220,39 +224,6 @@ void SpectrogramPlot::tunerMoved()
     emit repaint();
 }
 
-int SpectrogramPlot::getHeight()
-{
-    if (!inputSource)
-        return 0;
-
-    return inputSource->count() / getStride();
-}
-
-int SpectrogramPlot::getStride()
-{
-    return fftSize / zoomLevel;
-}
-
-off_t SpectrogramPlot::lineToSample(off_t line)
-{
-    return line * getStride();
-}
-
-int SpectrogramPlot::sampleToLine(off_t sample)
-{
-    return sample / getStride();
-}
-
-QString SpectrogramPlot::sampleToTime(off_t sample)
-{
-    return QString::number((float)sample / sampleRate).append("s");
-}
-
-int SpectrogramPlot::linesPerTile()
-{
-    return tileSize / fftSize;
-}
-
 uint qHash(const TileCacheKey &key, uint seed)
 {
     return key.fftSize ^ key.zoomLevel ^ key.sample ^ seed;
diff --git a/spectrogramplot.h b/spectrogramplot.h
index 170b2f8..f474171 100644
--- a/spectrogramplot.h
+++ b/spectrogramplot.h
@@ -41,40 +41,29 @@ class SpectrogramPlot : public Plot
 
 public:
     SpectrogramPlot(std::shared_ptr<SampleSource<std::complex<float>>> src);
-
     std::shared_ptr<AbstractSampleSource> output() override;
     void paintFront(QPainter &painter, QRect &rect, range_t<off_t> sampleRange) override;
     void paintMid(QPainter &painter, QRect &rect, range_t<off_t> sampleRange) override;
-
-    QSize sizeHint() const;
-    int getHeight();
-    int getStride();
-    off_t lineToSample(off_t line);
     bool mouseEvent(QEvent::Type type, QMouseEvent event) override;
 
-    std::shared_ptr<SampleSource<std::complex<float>>> inputSource;
-
 public slots:
-    void setSampleRate(int rate);
     void setFFTSize(int size);
     void setPowerMax(int power);
     void setPowerMin(int power);
     void setZoomLevel(int zoom);
     void tunerMoved();
 
-
 private:
     const int linesPerGraduation = 50;
     const int tileSize = 65536; // This must be a multiple of the maximum FFT size
 
+    std::shared_ptr<SampleSource<std::complex<float>>> inputSource;
     std::unique_ptr<FFT> fft;
     std::unique_ptr<float[]> window;
-    fftwf_complex *lineBuffer = nullptr;
     QCache<TileCacheKey, QPixmap> pixmapCache;
     QCache<TileCacheKey, float> fftCache;
     uint colormap[256];
 
-    int sampleRate;
     int fftSize;
     int zoomLevel;
     float powerMax;
@@ -87,11 +76,9 @@ private:
     QPixmap* getPixmapTile(off_t tile);
     float* getFFTTile(off_t tile);
     void getLine(float *dest, off_t sample);
+    int getStride();
     float getTunerCentre();
     std::vector<float> getTunerTaps();
-    void paintCursors(QPainter *painter, QRect rect);
-    int sampleToLine(off_t sample);
-    QString sampleToTime(off_t sample);
     int linesPerTile();
 };