diff --git a/mainwindow.cpp b/mainwindow.cpp
index fb61e3e..ed6ba5f 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -12,8 +12,9 @@ MainWindow::MainWindow()
     dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
     addDockWidget(Qt::LeftDockWidgetArea, dock);
 
-    connect(dock, SIGNAL(fftSizeChanged(int)), &spectrogram, SLOT(setFFTSize(int)));
     connect(dock->fileOpenButton, SIGNAL(clicked()), &spectrogram, SLOT(pickFile()));
+    connect(dock, SIGNAL(fftSizeChanged(int)), &spectrogram, SLOT(setFFTSize(int)));
+    connect(dock->zoomLevelSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setZoomLevel(int)));
     connect(dock->powerMaxSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setPowerMax(int)));
     connect(dock->powerMinSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setPowerMin(int)));
 }
\ No newline at end of file
diff --git a/spectrogram.cpp b/spectrogram.cpp
index d258525..f4d3f5e 100644
--- a/spectrogram.cpp
+++ b/spectrogram.cpp
@@ -141,7 +141,7 @@ void Spectrogram::getLine(float *dest, int y)
 {
 	if (inputSource && fft) {
 		fftwf_complex buffer[fftSize];
-		inputSource->getSamples(buffer, y * fftSize, fftSize);
+		inputSource->getSamples(buffer, y * getStride(), fftSize);
 
 		for (int i = 0; i < fftSize; i++) {
 			buffer[i][0] *= window[i];
@@ -187,10 +187,21 @@ void Spectrogram::setPowerMin(int power)
 	update();
 }
 
+void Spectrogram::setZoomLevel(int zoom)
+{
+	zoomLevel = clamp(zoom, 0, (int)log2(fftSize));
+	update();
+}
+
 int Spectrogram::getHeight()
 {
 	if (!inputSource)
 		return 0;
 
-	return inputSource->getSampleCount() / fftSize;
-}
\ No newline at end of file
+	return inputSource->getSampleCount() / getStride();
+}
+
+int Spectrogram::getStride()
+{
+	return fftSize / pow(2, zoomLevel);
+}
diff --git a/spectrogram.h b/spectrogram.h
index 537c607..b2a1ecc 100644
--- a/spectrogram.h
+++ b/spectrogram.h
@@ -19,6 +19,7 @@ public slots:
 	void setFFTSize(int size);
 	void setPowerMax(int power);
 	void setPowerMin(int power);
+	void setZoomLevel(int zoom);
 
 protected:
 	void paintEvent(QPaintEvent *event);
@@ -37,4 +38,5 @@ private:
 
 	void getLine(float *dest, int y);
 	int getHeight();
+	int getStride();
 };
\ No newline at end of file
diff --git a/spectrogramcontrols.cpp b/spectrogramcontrols.cpp
index f9e7f13..6b7755d 100644
--- a/spectrogramcontrols.cpp
+++ b/spectrogramcontrols.cpp
@@ -15,6 +15,11 @@ SpectrogramControls::SpectrogramControls(const QString & title, QWidget * parent
 	fftSizeSlider->setValue(10);
 	layout->addRow(new QLabel(tr("FFT size:")), fftSizeSlider);
 
+	zoomLevelSlider = new QSlider(Qt::Horizontal, widget);
+	zoomLevelSlider->setRange(0, 5);
+	zoomLevelSlider->setValue(0);
+	layout->addRow(new QLabel(tr("Zoom:")), zoomLevelSlider);
+
 	powerMaxSlider = new QSlider(Qt::Horizontal, widget);
 	powerMaxSlider->setRange(-100, 20);
 	powerMaxSlider->setValue(0);
diff --git a/spectrogramcontrols.h b/spectrogramcontrols.h
index c675c0b..e64274e 100644
--- a/spectrogramcontrols.h
+++ b/spectrogramcontrols.h
@@ -23,6 +23,7 @@ private:
 	QSlider *fftSizeSlider;
 public:
 	QPushButton *fileOpenButton;
+	QSlider *zoomLevelSlider;
 	QSlider *powerMaxSlider;
 	QSlider *powerMinSlider;
 };
\ No newline at end of file