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diff --git a/linden/indra/media_plugins/webkit/volume_catcher.h b/linden/indra/media_plugins/webkit/volume_catcher.h
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+/** 
+ * @file volume_catcher.h
+ * @brief Interface to a class with platform-specific implementations that allows control of the audio volume of all sources in the current process.
+ *
+ * @cond
+ * $LicenseInfo:firstyear=2010&license=viewergpl$
+ * 
+ * Copyright (c) 2010, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ * 
+ * @endcond
+ */
+
+#ifndef VOLUME_CATCHER_H
+#define VOLUME_CATCHER_H
+
+#include "linden_common.h"
+
+class VolumeCatcherImpl;
+
+class VolumeCatcher
+{
+ public:
+        VolumeCatcher();
+        ~VolumeCatcher();
+
+        void setVolume(F32 volume); // 0.0 - 1.0
+        
+        // Set the left-right pan of audio sources
+        // where -1.0 = left, 0 = center, and 1.0 = right
+        void setPan(F32 pan); 
+
+        void pump(); // call this at least a few times a second if you can - it affects how quickly we can 'catch' a new audio source and adjust its volume
+        
+ private:
+        VolumeCatcherImpl *pimpl;
+};
+
+#endif // VOLUME_CATCHER_H