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diff --git a/demos/modules/gaudio/oscilloscope/gwinosc.h b/demos/modules/gaudio/oscilloscope/gwinosc.h
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+/*
+ * Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
+ * Copyright (c) 2012, 2013, Andrew Hannam aka inmarket
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *    * Neither the name of the <organization> nor the
+ *      names of its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _GWINOSC_H
+#define _GWINOSC_H
+
+/**
+ * --------------------------- Our Custom GWIN Oscilloscope ---------------
+ *
+ * This GWIN superset implements a simple audio oscilloscope using the GAUDIN device.
+ *
+ * It makes many assumptions.
+ *
+ * The GMISC module with GMISC_NEED_ARRAYOPS could be used to process the samples more
+ * correctly if we were really building something generic.
+ */
+
+/* The extent of scaling for our audio data - fixed scale at the moment */
+#ifndef SCOPE_Y_BITS
+	#define SCOPE_Y_BITS			8					// 8 bits = 0..255
+#endif
+
+/* Trigger methods */
+#define TRIGGER_NONE			0					/* No triggering */
+#define TRIGGER_POSITIVERAMP	1					/* Trigger on a positive going signal */
+#define TRIGGER_MINVALUE		2					/* Trigger on reaching the minimum value from the last scope */
+
+/**
+ * Which trigger we want to use.
+ * Experiments suggests that TRIGGER_MINVALUE gives the best result
+ */
+#ifndef TRIGGER_METHOD
+	#define TRIGGER_METHOD			TRIGGER_MINVALUE
+#endif
+
+/* A scope window object. Treat it as a black box */
+typedef struct GScopeObject_t {
+	GWindowObject		g;						// Base Class
+
+	coord_t				*lastscopetrace;		// To store last scope trace
+	ArrayDataFormat		format;					// The sample format
+	coord_t				nextx;					// Where we are up to
+#if TRIGGER_METHOD == TRIGGER_POSITIVERAMP
+	coord_t				lasty;					// The last y value - used for trigger slope detection
+#elif TRIGGER_METHOD == TRIGGER_MINVALUE
+	coord_t				lasty;					// The last y value - used for trigger slope detection
+	coord_t				scopemin;				// The last scopes minimum value
+#endif
+	} GScopeObject;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+	/**
+	 * Create a scope window.
+	 */
+	GHandle gwinGScopeCreate(GDisplay *g, GScopeObject *gs, GWindowInit *pInit, uint16_t channel, uint32_t frequency, ArrayDataFormat format);
+	#define gwinScopeCreate(gs,pI,ch,f,fmt)		gwinGScopeCreate(GDISP,gs,pI,ch,f,fmt)
+
+	/**
+	 * Wait for a scope trace to be ready and then draw it.
+	 */
+	void gwinScopeWaitForTrace(GHandle gh);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _GWINOSC_H */