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diff --git a/arts/modules/synth/synth_tremolo_impl.cc b/arts/modules/synth/synth_tremolo_impl.cc
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+++ b/arts/modules/synth/synth_tremolo_impl.cc
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+/*
+
+    Copyright (C) 2000 Jeff Tranter
+                       tranter@pobox.com
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+  
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+   
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.
+
+    */
+
+#include <math.h>
+#include "artsmodulessynth.h"
+#include "stdsynthmodule.h"
+
+using namespace Arts;
+
+// The tremolo module modulates the amplitude according to a LFO-Wave.
+// Traditionally you would use a sine wave but why limit yourself?
+// What you get is a very intense effect that cuts through most
+// arrangements because of its high dynamic range.  The tremolo effect
+// is still one of guitarists favorite effects although it's not as
+// popular as in the 1960's.
+
+class Synth_TREMOLO_impl : virtual public Synth_TREMOLO_skel,
+							virtual public StdSynthModule
+{
+public:
+	void calculateBlock(unsigned long samples)
+	{
+		unsigned long i;
+		for(i=0; i<samples; i++)
+		{
+			// simply modulate the amplitude
+			outvalue[i] = invalue[i] * fabs(inlfo[i]);
+		}
+	}
+};
+
+REGISTER_IMPLEMENTATION(Synth_TREMOLO_impl);