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diff --git a/arts/modules/synth/synth_atan_saturate_impl.cpp b/arts/modules/synth/synth_atan_saturate_impl.cpp
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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., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+
+ */
+
+#include <stdio.h>
+#include <math.h>
+#include "artsmodulessynth.h"
+#include "stdsynthmodule.h"
+
+using namespace Arts;
+
+// This can be used to get the input signal to the normalized range
+// between -1 and 1 that Synth_PLAY can process. The louder the input
+// signal, the more the signal is distorted by this module. For very
+// small input signals, the output signal is about the input signal
+// (no change).
+
+class Synth_ATAN_SATURATE_impl : virtual public Synth_ATAN_SATURATE_skel,
+ virtual public StdSynthModule
+{
+protected:
+ float _inscale;
+
+public:
+ float inscale() { return _inscale; }
+
+ void inscale(float newInscale) { _inscale = newInscale; }
+
+ void calculateBlock(unsigned long samples)
+ {
+ for (unsigned long i=0; i<samples; i++)
+ outvalue[i] = atan(invalue[i]*_inscale)/(M_PI/2.0);
+ }
+};
+
+REGISTER_IMPLEMENTATION(Synth_ATAN_SATURATE_impl);