diff --git a/Source/envelope_component.cpp b/Source/envelope_component.cpp
index 72b7206..c203928 100644
--- a/Source/envelope_component.cpp
+++ b/Source/envelope_component.cpp
@@ -339,6 +339,11 @@ bool EnvelopeComponent::keyPressed(const KeyPress & ev)
         r = f(m_envelope->m_transform_y_tilt,0.02);
     if (ev == 'H')
         r = f(m_envelope->m_transform_y_tilt,-0.02);
+    if (ev == 'V')
+        r = f(m_envelope->m_transform_y_sinus_freq,1.0);
+    if (ev == 'B')
+        r = f(m_envelope->m_transform_y_sinus_freq,-1.0);
+    m_envelope->m_transform_y_sinus_freq = jlimit(1.0,64.0, m_envelope->m_transform_y_sinus_freq);
     if (r==true)
     {
         repaint();
diff --git a/Source/jcdp_envelope.h b/Source/jcdp_envelope.h
index c9d32a1..533e4f6 100644
--- a/Source/jcdp_envelope.h
+++ b/Source/jcdp_envelope.h
@@ -563,6 +563,7 @@ public:
 	double m_transform_y_shift = 0.0;
 	double m_transform_y_scale = 1.0;
     double m_transform_y_sinus = 0.0;
+    double m_transform_y_sinus_freq = 8.0;
     double m_transform_y_tilt = 0.0;
 	inline double getTransformedValue(double x)
 	{
@@ -574,7 +575,8 @@ public:
 		double v = GetInterpolatedNodeValue(temp);
 		double diff = 0.5 - v;
 		double scaled = 0.5 - m_transform_y_scale * diff;
-		double shifted = scaled + m_transform_y_shift + m_transform_y_sinus*sin(2*3.141592653*(x-m_transform_x_shift)*8.0);
+		double shifted = scaled + m_transform_y_shift + m_transform_y_sinus*
+            sin(2*3.141592653*(x-m_transform_x_shift)*m_transform_y_sinus_freq);
         double tiltline = 0.5+m_transform_y_tilt*x;
         double tilted = shifted+tiltline;
         return jlimit(0.0,1.0,tilted);