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diff --git a/arts/modules/synth/synth_autopanner_impl.cpp b/arts/modules/synth/synth_autopanner_impl.cpp
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+/*
+
+    Copyright (C) 2000 Jeff Tranter
+                       [email protected]
+
+    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., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+
+    */
+
+#include "artsmodulessynth.h"
+#include "stdsynthmodule.h"
+
+using namespace Arts;
+
+// An Autopanner is used to automatically pan the input signal between
+// the left and the right output. This makes mixes more lively. A
+// standard application would be a guitar or lead sound.  Connect a
+// LFO, a sine or saw wave for example to "inlfo" and select a
+// frequency between 0.1 and 5Hz for a traditional effect or even more
+// for Special FX.
+
+class Synth_AUTOPANNER_impl : virtual public Synth_AUTOPANNER_skel,
+							virtual public StdSynthModule
+{
+public:
+	void calculateBlock(unsigned long samples)
+	{
+		unsigned long i;
+		for(i=0; i<samples; i++)
+		{
+			outvalue1[i] = invalue[i] * (1.0 - (inlfo[i] + 1.0) / 2.0);
+			outvalue2[i] = invalue[i] * (inlfo[i] + 1.0) / 2.0;
+		}
+	}
+};
+
+REGISTER_IMPLEMENTATION(Synth_AUTOPANNER_impl);