diff --git a/src/demod/DemodulatorThread.cpp b/src/demod/DemodulatorThread.cpp
index e873400..7588521 100644
--- a/src/demod/DemodulatorThread.cpp
+++ b/src/demod/DemodulatorThread.cpp
@@ -6,7 +6,7 @@ DemodulatorThread::DemodulatorThread(DemodulatorThreadInputQueue* pQueue) :
         inputQueue(pQueue), visOutQueue(NULL), terminated(false), initialized(false), audio_resampler(NULL), resample_ratio(1), audio_resample_ratio(
                 1), resampler(NULL), commandQueue(NULL), fir_filter(NULL) {
 
-    float kf = 0.75;         // modulation factor
+    float kf = 0.5;         // modulation factor
     fdem = freqdem_create(kf);
 //    freqdem_print(fdem);
 
diff --git a/src/visual/WaterfallCanvas.cpp b/src/visual/WaterfallCanvas.cpp
index 971daa0..d763541 100644
--- a/src/visual/WaterfallCanvas.cpp
+++ b/src/visual/WaterfallCanvas.cpp
@@ -71,7 +71,7 @@ void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     }
 
     if (mTracker.mouseInView()) {
-        glContext->DrawFreqSelector(mTracker.getMouseX());
+        glContext->DrawFreqSelector(mTracker.getMouseX(),0,1,0);
     }
     glContext->EndDraw();
 
diff --git a/src/visual/WaterfallContext.cpp b/src/visual/WaterfallContext.cpp
index 7c10522..e7fd6f3 100644
--- a/src/visual/WaterfallContext.cpp
+++ b/src/visual/WaterfallContext.cpp
@@ -92,7 +92,9 @@ void WaterfallContext::DrawDemod(DemodulatorInstance *demod) {
     glDisable(GL_DEPTH_TEST);
     glDisable(GL_TEXTURE_2D);
 
-    glColor3f(1.0, 1.0, 1.0);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_DST_COLOR);
+    glColor4f(1.0, 1.0, 1.0, 0.6);
 
     glBegin(GL_LINES);
     glVertex3f((uxPos - 0.5) * 2.0, 1.0, 0.0);
@@ -107,11 +109,23 @@ void WaterfallContext::DrawDemod(DemodulatorInstance *demod) {
     glVertex3f((uxPos - 0.5) * 2.0 + ofs, -1.0, 0.0);
 
     glEnd();
+
+    glBlendFunc(GL_SRC_ALPHA, GL_DST_COLOR);
+    glColor4f(1.0, 1.0, 1.0, 0.2);
+    glBegin(GL_QUADS);
+    glVertex3f((uxPos - 0.5) * 2.0 - ofs, 1.0, 0.0);
+    glVertex3f((uxPos - 0.5) * 2.0 - ofs, -1.0, 0.0);
+
+    glVertex3f((uxPos - 0.5) * 2.0 + ofs, -1.0, 0.0);
+    glVertex3f((uxPos - 0.5) * 2.0 + ofs, 1.0, 0.0);
+    glEnd();
+
+    glDisable(GL_BLEND);
     glEnable(GL_DEPTH_TEST);
 
 }
 
-void WaterfallContext::DrawFreqSelector(float uxPos) {
+void WaterfallContext::DrawFreqSelector(float uxPos, float r = 1, float g = 1, float b = 1) {
     DemodulatorInstance *demod = wxGetApp().getDemodTest();
 
     if (!demod) {
@@ -121,7 +135,9 @@ void WaterfallContext::DrawFreqSelector(float uxPos) {
     glDisable(GL_DEPTH_TEST);
     glDisable(GL_TEXTURE_2D);
 
-    glColor3f(1.0, 1.0, 1.0);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_DST_COLOR);
+    glColor4f(r, g, b, 0.6);
 
     glBegin(GL_LINES);
     glVertex3f((uxPos - 0.5) * 2.0, 1.0, 0.0);
@@ -136,6 +152,7 @@ void WaterfallContext::DrawFreqSelector(float uxPos) {
     glVertex3f((uxPos - 0.5) * 2.0 + ofs, -1.0, 0.0);
 
     glEnd();
+    glDisable(GL_BLEND);
     glEnable(GL_DEPTH_TEST);
 
 }
diff --git a/src/visual/WaterfallContext.h b/src/visual/WaterfallContext.h
index 176a420..74db958 100644
--- a/src/visual/WaterfallContext.h
+++ b/src/visual/WaterfallContext.h
@@ -14,7 +14,7 @@ public:
 
     void BeginDraw();
     void Draw(std::vector<float> &points);
-    void DrawFreqSelector(float uxPos);
+    void DrawFreqSelector(float uxPos, float r, float g, float b);
     void DrawDemod(DemodulatorInstance *demod);
     void EndDraw();