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diff --git a/indra/media_plugins/webkit/windows_volume_catcher.cpp b/indra/media_plugins/webkit/windows_volume_catcher.cpp
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+/** 
+ * @file windows_volume_catcher.cpp
+ * @brief A Windows implementation of volume level control of all audio channels opened by a 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
+ */
+
+#include "volume_catcher.h"
+#include <windows.h>
+
+//
+// Abstracts a Win32 mixer line and associated state
+// for muting and changing volume on a given output
+//
+class Mixer
+{
+public:
+	static Mixer* create(U32 index);
+	~Mixer();
+
+	void setMute(bool mute);
+	void setVolume(F32 volume_left, F32 volume_right);
+
+private:
+	// use create(index) to create a Mixer
+	Mixer(HMIXER handle, U32 mute_control_id, U32 volume_control_id, U32 min_volume, U32 max_volume);
+
+	HMIXER	mHandle;		
+	U32		mMuteControlID;		// handle to mixer controller for muting
+	U32		mVolumeControlID;	// handle to mixer controller for changing volume
+	U32		mMinVolume;			// value that specifies minimum volume as reported by mixer
+	U32		mMaxVolume;			// value that specifies maximum volume as reported by mixer
+};
+
+// factory function that attempts to create a Mixer object associated with a given mixer line index
+// returns NULL if creation failed
+// static 
+Mixer* Mixer::create(U32 index)
+{
+	// get handle to mixer object
+	HMIXER mixer_handle;
+	MMRESULT result = mixerOpen( &mixer_handle,
+							index,	
+							0,	// HWND to call when state changes - not used
+							0,	// user data for callback - not used
+							MIXER_OBJECTF_MIXER );
+
+	if (result == MMSYSERR_NOERROR)
+	{
+		MIXERLINE mixer_line;
+		mixer_line.cbStruct = sizeof( MIXERLINE );
+
+		// try speakers first
+		mixer_line.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
+
+		MMRESULT result = mixerGetLineInfo( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
+								&mixer_line,
+								MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE );
+		if (result != MMSYSERR_NOERROR)
+		{	// failed - try headphones next
+			mixer_line.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_HEADPHONES;
+			result = mixerGetLineInfo( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
+									&mixer_line,
+									MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE );
+		}
+
+		if (result == MMSYSERR_NOERROR)
+		{	// successfully found mixer line object, now use it to get volume and mute controls
+
+			// reuse these objects to query for both volume and mute controls
+			MIXERCONTROL mixer_control;
+			MIXERLINECONTROLS mixer_line_controls;
+			mixer_line_controls.cbStruct = sizeof( MIXERLINECONTROLS );
+			mixer_line_controls.dwLineID = mixer_line.dwLineID;
+			mixer_line_controls.cControls = 1;
+			mixer_line_controls.cbmxctrl = sizeof( MIXERCONTROL );
+			mixer_line_controls.pamxctrl = &mixer_control;
+
+			// first, query for mute
+			mixer_line_controls.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;
+
+			// get control id for mute controls
+			result = mixerGetLineControls( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
+				&mixer_line_controls,
+				MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE );
+			if (result == MMSYSERR_NOERROR )
+			{	// we have a mute controls.  Remember the mute control id and then query for 
+				// volume controls using the same struct, but different dwControlType
+
+				U32 mute_control_id = mixer_control.dwControlID;
+				mixer_line_controls.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
+				result = mixerGetLineControls( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
+					&mixer_line_controls,
+					MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE );
+
+				if (result == MMSYSERR_NOERROR)
+				{	// we have both mute and volume controls for this mixer, so we're keeping it
+					return new Mixer(mixer_handle, 
+								mute_control_id, 
+								mixer_control.dwControlID, 
+								mixer_control.Bounds.dwMinimum, 
+								mixer_control.Bounds.dwMaximum);
+				}
+			}
+		}
+	}
+
+	// if we got here, we didn't successfully create a Mixer object
+	mixerClose(mixer_handle);
+	return NULL;
+}
+
+Mixer::Mixer(HMIXER handle, U32 mute_control_id, U32 volume_control_id, U32 min_volume, U32 max_volume)
+:	mHandle(handle),
+	mMuteControlID(mute_control_id),
+	mVolumeControlID(volume_control_id),
+	mMinVolume(min_volume),
+	mMaxVolume(max_volume)
+{}
+
+Mixer::~Mixer()
+{}
+
+// toggle mute for this mixer
+// if mute is set, then volume level will be ignored
+void Mixer::setMute(bool mute)
+{
+	MIXERCONTROLDETAILS_BOOLEAN mixer_control_details_bool = { mute };
+	MIXERCONTROLDETAILS mixer_control_details;
+	mixer_control_details.cbStruct = sizeof( MIXERCONTROLDETAILS );
+	mixer_control_details.dwControlID = mMuteControlID;
+	mixer_control_details.cChannels = 1;
+	mixer_control_details.cMultipleItems = 0;
+	mixer_control_details.cbDetails = sizeof( MIXERCONTROLDETAILS_BOOLEAN );
+	mixer_control_details.paDetails = &mixer_control_details_bool;
+
+	mixerSetControlDetails( reinterpret_cast< HMIXEROBJ >( mHandle ),
+								 &mixer_control_details,
+								 MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE );
+}
+
+// set individual volume levels for left and right channels
+// if mute is set, then these values will apply once mute is unset
+void Mixer::setVolume(F32 volume_left, F32 volume_right)
+{
+	// assuming pan is in range [-1, 1] set volume levels accordingly
+	// if pan == -1 then	volume_left_mixer = volume_left	&& volume_right_mixer = 0
+	// if pan == 0 then		volume_left_mixer = volume_left	&& volume_right_mixer = volume_right
+	// if pan == 1 then		volume_left_mixer = 0			&& volume_right_mixer = volume_right
+	U32 volume_left_mixer = (U32)
+							((F32)mMinVolume 
+								+ (volume_left * ((F32)mMaxVolume - (F32)mMinVolume)));
+	U32 volume_right_mixer = (U32)
+							((F32)mMinVolume 
+								+ (volume_right * ((F32)mMaxVolume - (F32)mMinVolume)));
+
+	// pass volume levels on to mixer
+	MIXERCONTROLDETAILS_UNSIGNED mixer_control_details_unsigned[ 2 ] = { volume_left_mixer, volume_right_mixer };
+	MIXERCONTROLDETAILS mixer_control_details;
+	mixer_control_details.cbStruct = sizeof( MIXERCONTROLDETAILS );
+	mixer_control_details.dwControlID = mVolumeControlID;
+	mixer_control_details.cChannels = 2;
+	mixer_control_details.cMultipleItems = 0;
+	mixer_control_details.cbDetails = sizeof( MIXERCONTROLDETAILS_UNSIGNED );
+	mixer_control_details.paDetails = &mixer_control_details_unsigned;
+
+	mixerSetControlDetails( reinterpret_cast< HMIXEROBJ >( mHandle ),
+								 &mixer_control_details,
+								 MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE );
+}
+
+class VolumeCatcherImpl
+{
+public:
+
+	void setVolume(F32 volume);
+	void setPan(F32 pan);
+	
+	static VolumeCatcherImpl *getInstance();
+private:
+	// This is a singleton class -- both callers and the component implementation should use getInstance() to find the instance.
+	VolumeCatcherImpl();
+	~VolumeCatcherImpl();
+
+	static VolumeCatcherImpl *sInstance;
+	
+	F32 	mVolume;
+	F32 	mPan;
+	typedef std::vector<Mixer*> mixer_vector_t;
+	mixer_vector_t	mMixers;
+};
+
+VolumeCatcherImpl *VolumeCatcherImpl::sInstance = NULL;
+
+VolumeCatcherImpl *VolumeCatcherImpl::getInstance()
+{
+	if(!sInstance)
+	{
+		sInstance = new VolumeCatcherImpl;
+	}
+	
+	return sInstance;
+}
+
+VolumeCatcherImpl::VolumeCatcherImpl()
+:	mVolume(1.0f),	// default volume is max
+	mPan(0.f)		// default pan is centered
+{
+	// for each reported mixer "device", create a proxy object and add to list
+	U32 num_mixers = mixerGetNumDevs();
+	for (U32 mixer_index = 0; mixer_index < num_mixers; ++mixer_index)
+	{
+		Mixer* mixerp = Mixer::create(mixer_index);
+		if (mixerp)
+		{
+			mMixers.push_back(mixerp);
+		}
+	}
+}
+
+VolumeCatcherImpl::~VolumeCatcherImpl()
+{
+	for(mixer_vector_t::iterator it = mMixers.begin(), end_it = mMixers.end();
+		it != end_it;
+		++it)
+	{
+		delete *it;
+		*it = NULL;
+	}
+}
+
+
+void VolumeCatcherImpl::setVolume(F32 volume)
+{
+	F32 left_volume = volume * min(1.f, 1.f - mPan);
+	F32 right_volume = volume * max(0.f, 1.f + mPan);
+	
+	for(mixer_vector_t::iterator it = mMixers.begin(), end_it = mMixers.end();
+		it != end_it;
+		++it)
+	{	// set volume levels and mute for each mixer
+		// note that a muted mixer will ignore this volume level
+
+		(*it)->setVolume(left_volume, right_volume);
+		
+		if (volume == 0.f && mVolume != 0.f)
+		{
+			(*it)->setMute(true);
+		}
+		else if (mVolume == 0.f && volume != 0.f)
+		{
+			(*it)->setMute(false);
+		}
+
+	}
+	mVolume = volume;
+}
+
+void VolumeCatcherImpl::setPan(F32 pan)
+{	// remember pan for calculating individual channel levels later
+	mPan = pan;
+}
+
+/////////////////////////////////////////////////////
+
+VolumeCatcher::VolumeCatcher()
+{
+	pimpl = VolumeCatcherImpl::getInstance();
+}
+
+VolumeCatcher::~VolumeCatcher()
+{
+	// Let the instance persist until exit.
+}
+
+void VolumeCatcher::setVolume(F32 volume)
+{
+	pimpl->setVolume(volume);
+}
+
+void VolumeCatcher::setPan(F32 pan)
+{
+	pimpl->setPan(pan);
+}
+
+void VolumeCatcher::pump()
+{
+	// No periodic tasks are necessary for this implementation.
+}
+