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diff --git a/modules/extlib_util.h b/modules/extlib_util.h
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+/*
+ *   Prototypes for utility functions used in pd externals 
+ *   Copyright (c) 2000-2003 by Tom Schouten
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program 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 General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef CREB_EXTLIB_UTIL_H
+#define CREB_EXTLIB_UTIL_H
+
+#include <math.h>
+#include "m_pd.h"
+
+/* envelope stuff */
+
+/* exponential range for envelopes is 60dB */
+#define ENVELOPE_RANGE 0.001f
+#define ENVELOPE_MAX   (1.0f - ENVELOPE_RANGE)
+#define ENVELOPE_MIN   ENVELOPE_RANGE
+
+/* convert milliseconds to 1-p, with p a real pole */
+float milliseconds_2_one_minus_realpole(float time);
+
+
+typedef union
+{
+    unsigned int i;
+    float f;
+} t_flint;
+
+/* check if floating point number is denormal */
+
+//#define IS_DENORMAL(f) (((*(unsigned int *)&(f))&0x7f800000) == 0) 
+
+#define IS_DENORMAL(f) (((((t_flint)(f)).i) & 0x7f800000) == 0)
+
+#endif /* CREB_EXTLIB_UTIL_H */
+