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diff --git a/externals/grill/flext/tutorial/attr1/main.cpp b/externals/grill/flext/tutorial/attr1/main.cpp
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+/* 
+flext tutorial - attributes 1
+
+Copyright (c) 2002 Thomas Grill (xovo@gmx.net)
+For information on usage and redistribution, and for a DISCLAIMER OF ALL
+WARRANTIES, see the file, "license.txt," in this distribution.  
+
+-------------------------------------------------------------------------
+
+This is an example of a simple object doing a float addition
+It is a variation of the tutorial "simple 2"
+*/
+
+
+// IMPORTANT: enable attribute processing (specify before inclusion of flext headers!)
+// For clarity, this is done here, but you'd better specify it as a compiler definition
+// FLEXT_ATTRIBUTES must be 0 or 1, 
+#define FLEXT_ATTRIBUTES 1
+
+
+// include flext header
+#include <flext.h>
+
+// check for appropriate flext version
+#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 400)
+#error You need at least flext version 0.4.0
+#endif
+
+
+class attr1:
+	public flext_base
+{
+	FLEXT_HEADER(attr1,flext_base)
+ 
+public:
+	// constructor 
+	attr1();
+
+protected:
+	void m_trigger(float f);   
+	
+	// stored argument
+	float arg; 
+
+private:
+	// callback for method "m_trigger" (with one float argument)
+	FLEXT_CALLBACK_F(m_trigger);  
+
+	// define attribute callbacks for variable "arg" (with GET and SET properties)
+	FLEXT_ATTRVAR_F(arg);  
+};
+
+// instantiate the class 
+FLEXT_NEW("attr1",attr1)
+
+
+attr1::attr1():
+	arg(0)  // initialize argument 
+{ 
+	// define inlets
+	AddInAnything();  // first inlet of type anything (index 0)
+	
+	// define outlets
+	AddOutFloat();  // one float outlet (has index 0)
+	
+	// register methods
+	FLEXT_ADDMETHOD(0,m_trigger);  // register method (for floats) "m_trigger" for inlet 0
+
+	FLEXT_ADDATTR_VAR1("arg",arg);  // register attribute "arg" with variable arg
+} 
+
+void attr1::m_trigger(float f)
+{
+	float res = arg+f;
+	
+	// output value to outlet
+	ToOutFloat(0,res); // (0 stands for the outlet index 0)
+}
+