diff --git a/assignment-client/src/audio/AudioMixer.cpp b/assignment-client/src/audio/AudioMixer.cpp
index 8caf4ddf09..8d87638434 100644
--- a/assignment-client/src/audio/AudioMixer.cpp
+++ b/assignment-client/src/audio/AudioMixer.cpp
@@ -428,8 +428,8 @@ int AudioMixer::addStreamToMixForListeningNodeWithStream(AudioMixerClientData* l
 }
 
 int AudioMixer::prepareMixForListeningNode(Node* node) {
-    AvatarAudioStream* nodeAudioStream = ((AudioMixerClientData*) node->getLinkedData())->getAvatarAudioStream();
-    AudioMixerClientData* listenerNodeData = (AudioMixerClientData*)node->getLinkedData();
+    AvatarAudioStream* nodeAudioStream = static_cast<AudioMixerClientData*>(node->getLinkedData())->getAvatarAudioStream();
+    AudioMixerClientData* listenerNodeData = static_cast<AudioMixerClientData*>(node->getLinkedData());
     
     // zero out the client mix for this node
     memset(_preMixSamples, 0, sizeof(_preMixSamples));
@@ -730,6 +730,33 @@ void AudioMixer::run() {
                         memcpy(dataAt, &sequence, sizeof(quint16));
                         dataAt += sizeof(quint16);
 
+                        // Pack stream properties
+                        bool inAZone = false;
+                        for (int i = 0; i < _zoneReverbSettings.size(); ++i) {
+                            AudioMixerClientData* data = static_cast<AudioMixerClientData*>(node->getLinkedData());
+                            glm::vec3 streamPosition = data->getAvatarAudioStream()->getPosition();
+                            if (_audioZones[_zoneReverbSettings[i].zone].contains(streamPosition)) {
+                                bool hasReverb = true;
+                                float reverbTime = _zoneReverbSettings[i].reverbTime;
+                                float wetLevel = _zoneReverbSettings[i].wetLevel;
+                                
+                                memcpy(dataAt, &hasReverb, sizeof(bool));
+                                dataAt += sizeof(bool);
+                                memcpy(dataAt, &reverbTime, sizeof(float));
+                                dataAt += sizeof(float);
+                                memcpy(dataAt, &wetLevel, sizeof(float));
+                                dataAt += sizeof(float);
+                                
+                                inAZone = true;
+                                break;
+                            }
+                        }
+                        if (!inAZone) {
+                            bool hasReverb = false;
+                            memcpy(dataAt, &hasReverb, sizeof(bool));
+                            dataAt += sizeof(bool);
+                        }
+                        
                         // pack mixed audio samples
                         memcpy(dataAt, _mixSamples, NETWORK_BUFFER_LENGTH_BYTES_STEREO);
                         dataAt += NETWORK_BUFFER_LENGTH_BYTES_STEREO;
@@ -1033,6 +1060,38 @@ void AudioMixer::parseSettingsObject(const QJsonObject &settingsObject) {
                 }
             }
         }
+        
+        const QString REVERB = "reverb";
+        if (audioEnvGroupObject[REVERB].isArray()) {
+            const QJsonArray& reverb = audioEnvGroupObject[REVERB].toArray();
+            
+            const QString ZONE = "zone";
+            const QString REVERB_TIME = "reverb_time";
+            const QString WET_LEVEL = "wet_level";
+            for (int i = 0; i < reverb.count(); ++i) {
+                QJsonObject reverbObject = reverb[i].toObject();
+                
+                if (reverbObject.contains(ZONE) &&
+                    reverbObject.contains(REVERB_TIME) &&
+                    reverbObject.contains(WET_LEVEL)) {
+                    
+                    bool okReverbTime, okWetLevel;
+                    QString zone = reverbObject.value(ZONE).toString();
+                    float reverbTime = reverbObject.value(REVERB_TIME).toString().toFloat(&okReverbTime);
+                    float wetLevel = reverbObject.value(WET_LEVEL).toString().toFloat(&okWetLevel);
+                    
+                    if (okReverbTime && okWetLevel && _audioZones.contains(zone)) {
+                        ReverbSettings settings;
+                        settings.zone = zone;
+                        settings.reverbTime = reverbTime;
+                        settings.wetLevel = wetLevel;
+                        
+                        _zoneReverbSettings.push_back(settings);
+                        qDebug() << "Added Reverb:" << zone << reverbTime << wetLevel;
+                    }
+                }
+            }
+        }
     }
 }
 
diff --git a/assignment-client/src/audio/AudioMixer.h b/assignment-client/src/audio/AudioMixer.h
index 3cfa5443a8..ff976dec61 100644
--- a/assignment-client/src/audio/AudioMixer.h
+++ b/assignment-client/src/audio/AudioMixer.h
@@ -82,7 +82,13 @@ private:
         float coefficient;
     };
     QVector<ZonesSettings> _zonesSettings;
-
+    struct ReverbSettings {
+        QString zone;
+        float reverbTime;
+        float wetLevel;
+    };
+    QVector<ReverbSettings> _zoneReverbSettings;
+    
     static InboundAudioStream::Settings _streamSettings;
 
     static bool _printStreamStats;
diff --git a/assignment-client/src/metavoxels/MetavoxelServer.cpp b/assignment-client/src/metavoxels/MetavoxelServer.cpp
index 3cf01bdc9f..81e86dbf11 100644
--- a/assignment-client/src/metavoxels/MetavoxelServer.cpp
+++ b/assignment-client/src/metavoxels/MetavoxelServer.cpp
@@ -237,8 +237,7 @@ void MetavoxelSession::update() {
         
         // go back to the beginning with the current packet and note that there's a delta pending
         _sequencer.getOutputStream().getUnderlying().device()->seek(start);
-        MetavoxelDeltaPendingMessage msg = { ++_reliableDeltaID, sendRecord->getPacketNumber(),
-            _sequencer.getIncomingPacketNumber() };
+        MetavoxelDeltaPendingMessage msg = { ++_reliableDeltaID, sendRecord->getPacketNumber(), _lodPacketNumber };
         out << (_reliableDeltaMessage = QVariant::fromValue(msg));
         _sequencer.endPacket();
         
@@ -265,7 +264,8 @@ void MetavoxelSession::handleMessage(const QVariant& message) {
     if (userType == ClientStateMessage::Type) {
         ClientStateMessage state = message.value<ClientStateMessage>();
         _lod = state.lod;
-    
+        _lodPacketNumber = _sequencer.getIncomingPacketNumber();
+        
     } else if (userType == MetavoxelEditMessage::Type) {
         QMetaObject::invokeMethod(_sender->getServer(), "applyEdit", Q_ARG(const MetavoxelEditMessage&,
             message.value<MetavoxelEditMessage>()));
diff --git a/assignment-client/src/metavoxels/MetavoxelServer.h b/assignment-client/src/metavoxels/MetavoxelServer.h
index 840041e0f0..a4facb5426 100644
--- a/assignment-client/src/metavoxels/MetavoxelServer.h
+++ b/assignment-client/src/metavoxels/MetavoxelServer.h
@@ -127,6 +127,7 @@ private:
     MetavoxelSender* _sender;
     
     MetavoxelLOD _lod;
+    int _lodPacketNumber;
     
     ReliableChannel* _reliableDeltaChannel;
     int _reliableDeltaReceivedOffset;
diff --git a/cmake/modules/FindGverb.cmake b/cmake/modules/FindGverb.cmake
new file mode 100644
index 0000000000..549c23c8a9
--- /dev/null
+++ b/cmake/modules/FindGverb.cmake
@@ -0,0 +1,39 @@
+#  FindGVerb.cmake
+# 
+#  Try to find the Gverb library.
+#
+#  You must provide a GVERB_ROOT_DIR which contains src and include directories
+#
+#  Once done this will define
+#
+#  GVERB_FOUND - system found Gverb
+#  GVERB_INCLUDE_DIRS - the Gverb include directory
+#
+#  Copyright 2014 High Fidelity, Inc.
+#
+#  Distributed under the Apache License, Version 2.0.
+#  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+#
+
+if (GVERB_INCLUDE_DIRS)
+  # in cache already
+  set(GVERB_FOUND TRUE)
+else (GVERB_INCLUDE_DIRS)
+
+  include("${MACRO_DIR}/HifiLibrarySearchHints.cmake")
+  hifi_library_search_hints("gverb")
+
+  find_path(GVERB_INCLUDE_DIRS gverb.h PATH_SUFFIXES include HINTS ${GVERB_SEARCH_DIRS})
+  find_path(GVERB_SRC_DIRS gverb.c PATH_SUFFIXES src HINTS ${GVERB_SEARCH_DIRS})
+
+  if (GVERB_INCLUDE_DIRS)
+    set(GVERB_FOUND TRUE)
+  endif (GVERB_INCLUDE_DIRS)
+
+  if (GVERB_FOUND)
+    message(STATUS "Found Gverb: ${GVERB_INCLUDE_DIRS}")
+  else (GVERB_FOUND)
+    message(FATAL_ERROR "Could NOT find Gverb. Read ./interface/externals/gverb/readme.txt")
+  endif (GVERB_FOUND)
+
+endif(GVERB_INCLUDE_DIRS)
\ No newline at end of file
diff --git a/domain-server/resources/describe-settings.json b/domain-server/resources/describe-settings.json
index 2c33897d07..026fe252b2 100644
--- a/domain-server/resources/describe-settings.json
+++ b/domain-server/resources/describe-settings.json
@@ -154,6 +154,33 @@
             "placeholder": "0.18"
           }
         ]
+      },
+      {
+        "name": "reverb",
+        "type": "table",
+        "label": "Reverb Settings",
+        "help": "In this table you can set custom reverb values for each audio zones",
+        "numbered": true,
+        "columns": [
+          {
+            "name": "zone",
+            "label": "Zone",
+            "can_set": true,
+            "placeholder": "Audio_Zone"
+          },
+          {
+            "name": "reverb_time",
+            "label": "Reverb Decay Time",
+            "can_set": true,
+            "placeholder": "(in sec)"
+          },
+          {
+            "name": "wet_level",
+            "label": "Wet Level",
+            "can_set": true,
+            "placeholder": "(in db)"
+          }
+        ]
       }
     ]
   },
diff --git a/examples/audioReverbOn.js b/examples/audioReverbOn.js
new file mode 100644
index 0000000000..479f5bba74
--- /dev/null
+++ b/examples/audioReverbOn.js
@@ -0,0 +1,39 @@
+//
+//  audioReverbOn.js
+//  examples
+//
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+
+// http://wiki.audacityteam.org/wiki/GVerb#Instant_reverb_settings
+var audioOptions = new AudioEffectOptions({
+                                          // Square Meters
+                                          maxRoomSize: 50,
+                                          roomSize: 50,
+                                          
+                                          // Seconds
+                                          reverbTime: 4,
+                                          
+                                          // Between 0 - 1
+                                          damping: 0.50,
+                                          inputBandwidth: 0.75,
+                                          
+                                          // dB
+                                          earlyLevel: -22,
+                                          tailLevel: -28,
+                                          dryLevel: 0,
+                                          wetLevel: 6
+});
+
+AudioDevice.setReverbOptions(audioOptions);
+AudioDevice.setReverb(true);
+print("Reverb is now on with the updated options.");
+
+function scriptEnding() {
+    AudioDevice.setReverb(false);
+    print("Reberb is now off.");
+}
+
+Script.scriptEnding.connect(scriptEnding);
\ No newline at end of file
diff --git a/examples/libraries/entitySelectionTool.js b/examples/libraries/entitySelectionTool.js
index b70c2187c2..f1a94dbdd7 100644
--- a/examples/libraries/entitySelectionTool.js
+++ b/examples/libraries/entitySelectionTool.js
@@ -78,6 +78,8 @@ SelectionManager = (function() {
             that.worldDimensions = null;
             that.worldPosition = null;
         } else if (that.selections.length == 1) {
+            SelectionDisplay.setSpaceMode(SPACE_LOCAL);
+
             var properties = Entities.getEntityProperties(that.selections[0]);
             that.localDimensions = properties.dimensions;
             that.localPosition = properties.position;
@@ -622,8 +624,8 @@ SelectionDisplay = (function () {
             
         }
 
-        var diagonal = (Vec3.length(properties.dimensions) / 2) * 1.1;
-        var halfDimensions = Vec3.multiply(properties.dimensions, 0.5);
+        var diagonal = (Vec3.length(selectionManager.worldDimensions) / 2) * 1.1;
+        var halfDimensions = Vec3.multiply(selectionManager.worldDimensions, 0.5);
         innerRadius = diagonal;
         outerRadius = diagonal * 1.15;
         var innerActive = false;
@@ -843,7 +845,7 @@ SelectionDisplay = (function () {
 
         Overlays.editOverlay(grabberMoveUp, { visible: translateHandlesVisible, position: { x: boundsCenter.x, y: top + grabberMoveUpOffset, z: boundsCenter.z } });
 
-        that.updateHandles(entityID);
+        that.updateHandles();
 
 
         Overlays.editOverlay(baseOfEntityProjectionOverlay, 
@@ -924,18 +926,17 @@ SelectionDisplay = (function () {
         entitySelected = false;
     };
 
-    that.updateHandles = function(entityID) {
-        if (!entitySelected) {
+    that.updateHandles = function() {
+        // print("Updating handles");
+        if (SelectionManager.selections.length == 0) {
             that.setOverlaysVisible(false);
             return;
         }
 
-        var properties = Entities.getEntityProperties(entityID);
-
         var rotation, dimensions, position;
 
         if (spaceMode == SPACE_LOCAL) {
-            rotation = properties.rotation;
+            rotation = SelectionManager.localRotation;
             dimensions = SelectionManager.localDimensions;
             position = SelectionManager.localPosition;
         } else {
@@ -1095,6 +1096,44 @@ SelectionDisplay = (function () {
         entitySelected = false;
     };
 
+    function applyEntityProperties(data) {
+        for (var i = 0; i < data.length; i++) {
+            var entityID = data[i].entityID;
+            var properties = data[i].properties;
+            Entities.editEntity(entityID, properties);
+        }
+        selectionManager._update();
+    };
+
+    // For currently selected entities, push a command to the UndoStack that uses the current entity properties for the
+    // redo command, and the saved properties for the undo command.
+    function pushCommandForSelections() {
+        var undoData = [];
+        var redoData = [];
+        for (var i = 0; i < SelectionManager.selections.length; i++) {
+            var entityID = SelectionManager.selections[i];
+            var initialProperties = SelectionManager.savedProperties[entityID.id];
+            var currentProperties = Entities.getEntityProperties(entityID);
+            undoData.push({
+                entityID: entityID,
+                properties: {
+                    position: initialProperties.position,
+                    rotation: initialProperties.rotation,
+                    dimensions: initialProperties.dimensions,
+                },
+            });
+            redoData.push({
+                entityID: entityID,
+                properties: {
+                    position: currentProperties.position,
+                    rotation: currentProperties.rotation,
+                    dimensions: currentProperties.dimensions,
+                },
+            });
+        }
+        UndoStack.pushCommand(applyEntityProperties, undoData, applyEntityProperties, redoData);
+    }
+
     var lastXZPick = null;
     var translateXZTool = {
         mode: 'TRANSLATE_XZ',
@@ -1114,6 +1153,8 @@ SelectionDisplay = (function () {
                     var initialProperties = SelectionManager.savedProperties[entityID.id];
                     Entities.editEntity(entityID, initialProperties);
                 }
+            } else {
+                pushCommandForSelections();
             }
         },
         onMove: function(event) {
@@ -1172,6 +1213,8 @@ SelectionDisplay = (function () {
                     var initialProperties = SelectionManager.savedProperties[entityID.id];
                     Entities.editEntity(entityID, initialProperties);
                 }
+            } else {
+                pushCommandForSelections();
             }
         },
         onMove: function(event) {
@@ -1334,6 +1377,8 @@ SelectionDisplay = (function () {
                     var initialProperties = SelectionManager.savedProperties[entityID.id];
                     Entities.editEntity(entityID, initialProperties);
                 }
+            } else {
+                pushCommandForSelections();
             }
         };
 
@@ -1496,6 +1541,8 @@ SelectionDisplay = (function () {
                     var initialProperties = SelectionManager.savedProperties[entityID.id];
                     Entities.editEntity(entityID, initialProperties);
                 }
+            } else {
+                pushCommandForSelections();
             }
         },
         onMove: function(event) {
@@ -1602,6 +1649,8 @@ SelectionDisplay = (function () {
                     var initialProperties = SelectionManager.savedProperties[entityID.id];
                     Entities.editEntity(entityID, initialProperties);
                 }
+            } else {
+                pushCommandForSelections();
             }
         },
         onMove: function(event) {
@@ -1706,6 +1755,8 @@ SelectionDisplay = (function () {
                     var initialProperties = SelectionManager.savedProperties[entityID.id];
                     Entities.editEntity(entityID, initialProperties);
                 }
+            } else {
+                pushCommandForSelections();
             }
         },
         onMove: function(event) {
diff --git a/examples/newEditEntities.js b/examples/newEditEntities.js
index 9b46cdaf3f..4d5abaf254 100644
--- a/examples/newEditEntities.js
+++ b/examples/newEditEntities.js
@@ -35,7 +35,7 @@ var entityPropertyDialogBox = EntityPropertyDialogBox;
 Script.include("libraries/entityCameraTool.js");
 var entityCameraTool = new EntityCameraTool();
 
-selectionManager.setEventListener(selectionDisplay.updateHandles());
+selectionManager.setEventListener(selectionDisplay.updateHandles);
 
 var windowDimensions = Controller.getViewportDimensions();
 var toolIconUrl = HIFI_PUBLIC_BUCKET + "images/tools/";
@@ -608,9 +608,12 @@ function handeMenuEvent(menuItem) {
     } else if (menuItem == "Delete") {
         if (entitySelected) {
             print("  Delete Entity.... selectedEntityID="+ selectedEntityID);
-            Entities.deleteEntity(selectedEntityID);
+            for (var i = 0; i < selectionManager.selections.length; i++) {
+                Entities.deleteEntity(selectionManager.selections[i]);
+            }
             selectionDisplay.unselect(selectedEntityID);
             entitySelected = false;
+            selectionManager.clearSelections();
         } else {
             print("  Delete Entity.... not holding...");
         }
@@ -618,7 +621,7 @@ function handeMenuEvent(menuItem) {
         // good place to put the properties dialog
 
         editModelID = -1;
-        if (entitySelected) {
+        if (selectionManager.selections.length == 1) {
             print("  Edit Properties.... selectedEntityID="+ selectedEntityID);
             editModelID = selectedEntityID;
         } else {
@@ -653,7 +656,7 @@ Controller.keyReleaseEvent.connect(function (event) {
     if (event.text == "`") {
         handeMenuEvent("Edit Properties...");
     }
-    if (event.text == "BACKSPACE") {
+    if (event.text == "BACKSPACE" || event.text == "DELETE") {
         handeMenuEvent("Delete");
     } else if (event.text == "TAB") {
         selectionDisplay.toggleSpaceMode();
diff --git a/interface/CMakeLists.txt b/interface/CMakeLists.txt
index db5aa64210..a150a308e0 100644
--- a/interface/CMakeLists.txt
+++ b/interface/CMakeLists.txt
@@ -2,7 +2,7 @@ set(TARGET_NAME interface)
 project(${TARGET_NAME})
 
 # set a default root dir for each of our optional externals if it was not passed
-set(OPTIONAL_EXTERNALS "Faceshift" "LibOVR" "PrioVR" "Sixense" "Visage" "LeapMotion" "RtMidi" "Qxmpp" "SDL2")
+set(OPTIONAL_EXTERNALS "Faceshift" "LibOVR" "PrioVR" "Sixense" "Visage" "LeapMotion" "RtMidi" "Qxmpp" "SDL2" "Gverb")
 foreach(EXTERNAL ${OPTIONAL_EXTERNALS})
   string(TOUPPER ${EXTERNAL} ${EXTERNAL}_UPPERCASE)
   if (NOT ${${EXTERNAL}_UPPERCASE}_ROOT_DIR)
@@ -14,6 +14,10 @@ endforeach()
 find_package(Qt5LinguistTools REQUIRED)
 find_package(Qt5LinguistToolsMacros)
 
+
+# As Gverb is currently the only reverb library, it's required.
+find_package(Gverb REQUIRED)
+
 if (DEFINED ENV{JOB_ID})
   set(BUILD_SEQ $ENV{JOB_ID})
 else ()
@@ -166,6 +170,13 @@ if (QXMPP_FOUND AND NOT DISABLE_QXMPP AND WIN32)
   add_definitions(-DQXMPP_STATIC) 
 endif ()
 
+if (GVERB_FOUND)
+  file(GLOB GVERB_SRCS ${GVERB_SRC_DIRS}/*.c)
+  include_directories(${GVERB_INCLUDE_DIRS})
+  add_library(gverb STATIC ${GVERB_SRCS})
+  target_link_libraries(${TARGET_NAME} gverb)
+endif (GVERB_FOUND)
+
 # include headers for interface and InterfaceConfig.
 include_directories("${PROJECT_SOURCE_DIR}/src" "${PROJECT_BINARY_DIR}/includes")
 
diff --git a/interface/external/gverb/readme.txt b/interface/external/gverb/readme.txt
new file mode 100644
index 0000000000..aa2fe8a602
--- /dev/null
+++ b/interface/external/gverb/readme.txt
@@ -0,0 +1,15 @@
+
+Instructions for adding the Gverb library to Interface
+(This is a required library)
+Clément Brisset, Octobre 22nd, 2014
+
+1. Go to https://github.com/highfidelity/gverb
+   Or download the sources directly via this link: 
+   https://github.com/highfidelity/gverb/archive/master.zip
+
+2. Extract the archive
+
+3. Place the directories “include” and “src” in interface/external/gverb 
+   (Normally next to this readme)
+
+4. Clear your build directory, run cmake, build and you should be all set.
\ No newline at end of file
diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index 99c23f526b..c379f701cf 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -172,6 +172,8 @@ Application::Application(int& argc, char** argv, QElapsedTimer &startup_time) :
         _nodeBoundsDisplay(this),
         _previousScriptLocation(),
         _applicationOverlay(),
+        _undoStack(),
+        _undoStackScriptingInterface(&_undoStack),
         _runningScriptsWidget(NULL),
         _runningScriptsWidgetWasVisible(false),
         _trayIcon(new QSystemTrayIcon(_window)),
@@ -3811,6 +3813,8 @@ ScriptEngine* Application::loadScript(const QString& scriptFilename, bool isUser
     scriptEngine->registerGlobalObject("Joysticks", &JoystickScriptingInterface::getInstance());
     qScriptRegisterMetaType(scriptEngine, joystickToScriptValue, joystickFromScriptValue);
 
+    scriptEngine->registerGlobalObject("UndoStack", &_undoStackScriptingInterface);
+
 #ifdef HAVE_RTMIDI
     scriptEngine->registerGlobalObject("MIDI", &MIDIManager::getInstance());
 #endif
diff --git a/interface/src/Application.h b/interface/src/Application.h
index 64c7032403..4779f9c810 100644
--- a/interface/src/Application.h
+++ b/interface/src/Application.h
@@ -91,6 +91,9 @@
 #include "voxels/VoxelSystem.h"
 
 
+#include "UndoStackScriptingInterface.h"
+
+
 class QAction;
 class QActionGroup;
 class QGLWidget;
@@ -450,6 +453,7 @@ private:
     int _numChangedSettings;
 
     QUndoStack _undoStack;
+    UndoStackScriptingInterface _undoStackScriptingInterface;
 
     glm::vec3 _gravity;
 
diff --git a/interface/src/Audio.cpp b/interface/src/Audio.cpp
index 365064e979..dd84eb3211 100644
--- a/interface/src/Audio.cpp
+++ b/interface/src/Audio.cpp
@@ -92,6 +92,8 @@ Audio::Audio(QObject* parent) :
     _collisionSoundDuration(0.0f),
     _proceduralEffectSample(0),
     _muted(false),
+    _reverb(false),
+    _reverbOptions(&_scriptReverbOptions),
     _processSpatialAudio(false),
     _spatialAudioStart(0),
     _spatialAudioFinish(0),
@@ -123,11 +125,14 @@ Audio::Audio(QObject* parent) :
     memset(_localProceduralSamples, 0, NETWORK_BUFFER_LENGTH_BYTES_PER_CHANNEL);
     // Create the noise sample array
     _noiseSampleFrames = new float[NUMBER_OF_NOISE_SAMPLE_FRAMES];
-
+    
     connect(&_receivedAudioStream, &MixedProcessedAudioStream::addedSilence, this, &Audio::addStereoSilenceToScope, Qt::DirectConnection);
     connect(&_receivedAudioStream, &MixedProcessedAudioStream::addedLastFrameRepeatedWithFade, this, &Audio::addLastFrameRepeatedWithFadeToScope, Qt::DirectConnection);
     connect(&_receivedAudioStream, &MixedProcessedAudioStream::addedStereoSamples, this, &Audio::addStereoSamplesToScope, Qt::DirectConnection);
     connect(&_receivedAudioStream, &MixedProcessedAudioStream::processSamples, this, &Audio::processReceivedSamples, Qt::DirectConnection);
+    
+    // Initialize GVerb
+    initGverb();
 }
 
 void Audio::init(QGLWidget *parent) {
@@ -489,6 +494,69 @@ bool Audio::switchOutputToAudioDevice(const QString& outputDeviceName) {
     return switchOutputToAudioDevice(getNamedAudioDeviceForMode(QAudio::AudioOutput, outputDeviceName));
 }
 
+void Audio::initGverb() {
+    // Initialize a new gverb instance
+    _gverb = gverb_new(_outputFormat.sampleRate(), _reverbOptions->getMaxRoomSize(), _reverbOptions->getRoomSize(),
+                       _reverbOptions->getReverbTime(), _reverbOptions->getDamping(), _reverbOptions->getSpread(),
+                       _reverbOptions->getInputBandwidth(), _reverbOptions->getEarlyLevel(),
+                       _reverbOptions->getTailLevel());
+
+    // Configure the instance (these functions are not super well named - they actually set several internal variables)
+    gverb_set_roomsize(_gverb, _reverbOptions->getRoomSize());
+    gverb_set_revtime(_gverb, _reverbOptions->getReverbTime());
+    gverb_set_damping(_gverb, _reverbOptions->getDamping());
+    gverb_set_inputbandwidth(_gverb, _reverbOptions->getInputBandwidth());
+    gverb_set_earlylevel(_gverb, DB_CO(_reverbOptions->getEarlyLevel()));
+    gverb_set_taillevel(_gverb, DB_CO(_reverbOptions->getTailLevel()));
+}
+
+void Audio::setReverbOptions(const AudioEffectOptions* options) {
+    // Save the new options
+    _scriptReverbOptions.setMaxRoomSize(options->getMaxRoomSize());
+    _scriptReverbOptions.setRoomSize(options->getRoomSize());
+    _scriptReverbOptions.setReverbTime(options->getReverbTime());
+    _scriptReverbOptions.setDamping(options->getDamping());
+    _scriptReverbOptions.setSpread(options->getSpread());
+    _scriptReverbOptions.setInputBandwidth(options->getInputBandwidth());
+    _scriptReverbOptions.setEarlyLevel(options->getEarlyLevel());
+    _scriptReverbOptions.setTailLevel(options->getTailLevel());
+
+    _scriptReverbOptions.setDryLevel(options->getDryLevel());
+    _scriptReverbOptions.setWetLevel(options->getWetLevel());
+
+    if (_reverbOptions == &_scriptReverbOptions) {
+        // Apply them to the reverb instance(s)
+        initGverb();
+    }
+}
+
+void Audio::addReverb(int16_t* samplesData, int numSamples, QAudioFormat& audioFormat) {
+    float dryFraction = DB_CO(_reverbOptions->getDryLevel());
+    float wetFraction = DB_CO(_reverbOptions->getWetLevel());
+    
+    float lValue,rValue;
+    for (int sample = 0; sample < numSamples; sample += audioFormat.channelCount()) {
+        // Run GVerb
+        float value = (float)samplesData[sample];
+        gverb_do(_gverb, value, &lValue, &rValue);
+
+        // Mix, accounting for clipping, the left and right channels. Ignore the rest.
+        for (unsigned int j = sample; j < sample + audioFormat.channelCount(); j++) {
+            if (j == sample) {
+                // left channel
+                int lResult = glm::clamp((int)(samplesData[j] * dryFraction + lValue * wetFraction), -32768, 32767);
+                samplesData[j] = (int16_t)lResult;
+            } else if (j == (sample + 1)) {
+                // right channel
+                int rResult = glm::clamp((int)(samplesData[j] * dryFraction + rValue * wetFraction), -32768, 32767);
+                samplesData[j] = (int16_t)rResult;
+            } else {
+                // ignore channels above 2
+            }
+        }
+    }
+}
+
 void Audio::handleAudioInput() {
     static char audioDataPacket[MAX_PACKET_SIZE];
 
@@ -720,7 +788,6 @@ void Audio::handleAudioInput() {
         NodeList* nodeList = NodeList::getInstance();
         SharedNodePointer audioMixer = nodeList->soloNodeOfType(NodeType::AudioMixer);
         
-        
         if (_recorder && _recorder.data()->isRecording()) {
             _recorder.data()->record(reinterpret_cast<char*>(networkAudioSamples), numNetworkBytes);
         }
@@ -840,12 +907,10 @@ void Audio::addLastFrameRepeatedWithFadeToScope(int samplesPerChannel) {
 }
 
 void Audio::processReceivedSamples(const QByteArray& inputBuffer, QByteArray& outputBuffer) {
-
     const int numNetworkOutputSamples = inputBuffer.size() / sizeof(int16_t);
     const int numDeviceOutputSamples = numNetworkOutputSamples * (_outputFormat.sampleRate() * _outputFormat.channelCount())
         / (_desiredOutputFormat.sampleRate() * _desiredOutputFormat.channelCount());
 
-
     outputBuffer.resize(numDeviceOutputSamples * sizeof(int16_t));
 
     const int16_t* receivedSamples;
@@ -884,10 +949,37 @@ void Audio::processReceivedSamples(const QByteArray& inputBuffer, QByteArray& ou
         numNetworkOutputSamples,
         numDeviceOutputSamples,
         _desiredOutputFormat, _outputFormat);
+    
+    if(_reverb || _receivedAudioStream.hasReverb()) {
+        bool reverbChanged = false;
+        if (_receivedAudioStream.hasReverb()) {
+            
+            if (_zoneReverbOptions.getReverbTime() != _receivedAudioStream.getRevebTime()) {
+                _zoneReverbOptions.setReverbTime(_receivedAudioStream.getRevebTime());
+                reverbChanged = true;
+            }
+            if (_zoneReverbOptions.getWetLevel() != _receivedAudioStream.getWetLevel()) {
+                _zoneReverbOptions.setWetLevel(_receivedAudioStream.getWetLevel());
+                reverbChanged = true;
+            }
+            
+            if (_reverbOptions != &_zoneReverbOptions) {
+                _reverbOptions = &_zoneReverbOptions;
+                reverbChanged = true;
+            }
+        } else if (_reverbOptions != &_scriptReverbOptions) {
+            _reverbOptions = &_scriptReverbOptions;
+            reverbChanged = true;
+        }
+        
+        if (reverbChanged) {
+            initGverb();
+        }
+        addReverb((int16_t*)outputBuffer.data(), numDeviceOutputSamples, _outputFormat);
+    }
 }
 
 void Audio::addReceivedAudioToStream(const QByteArray& audioByteArray) {
-
     if (_audioOutput) {
         // Audio output must exist and be correctly set up if we're going to process received audio
         _receivedAudioStream.parseData(audioByteArray);
diff --git a/interface/src/Audio.h b/interface/src/Audio.h
index e397f9564b..900b6ce0d6 100644
--- a/interface/src/Audio.h
+++ b/interface/src/Audio.h
@@ -43,6 +43,14 @@
 #include <StdDev.h>
 
 #include "MixedProcessedAudioStream.h"
+#include "AudioEffectOptions.h"
+#include <AudioRingBuffer.h>
+#include <StdDev.h>
+
+extern "C" {
+    #include <gverb.h>
+    #include <gverbdsp.h>
+}
 
 static const int NUM_AUDIO_CHANNELS = 2;
 
@@ -159,6 +167,8 @@ public slots:
 
     float getInputVolume() const { return (_audioInput) ? _audioInput->volume() : 0.0f; }
     void setInputVolume(float volume) { if (_audioInput) _audioInput->setVolume(volume); }
+    void setReverb(bool reverb) { _reverb = reverb; }
+    void setReverbOptions(const AudioEffectOptions* options);
 
     const AudioStreamStats& getAudioMixerAvatarStreamAudioStats() const { return _audioMixerAvatarStreamAudioStats; }
     const QHash<QUuid, AudioStreamStats>& getAudioMixerInjectedStreamAudioStatsMap() const { return _audioMixerInjectedStreamAudioStatsMap; }
@@ -230,6 +240,11 @@ private:
     int _proceduralEffectSample;
     bool _muted;
     bool _localEcho;
+    bool _reverb;
+    AudioEffectOptions _scriptReverbOptions;
+    AudioEffectOptions _zoneReverbOptions;
+    AudioEffectOptions* _reverbOptions;
+    ty_gverb *_gverb;
     GLuint _micTextureId;
     GLuint _muteTextureId;
     GLuint _boxTextureId;
@@ -249,6 +264,10 @@ private:
     //  2. Mix with the audio input
     void processProceduralAudio(int16_t* monoInput, int numSamples);
 
+    // Adds Reverb
+    void initGverb();
+    void addReverb(int16_t* samples, int numSamples, QAudioFormat& format);
+
     // Add sounds that we want the user to not hear themselves, by adding on top of mic input signal
     void addProceduralSounds(int16_t* monoInput, int numSamples);
 
diff --git a/interface/src/devices/OculusManager.cpp b/interface/src/devices/OculusManager.cpp
index 62894510c2..709080e354 100644
--- a/interface/src/devices/OculusManager.cpp
+++ b/interface/src/devices/OculusManager.cpp
@@ -66,8 +66,6 @@ glm::vec3 OculusManager::_calibrationPosition;
 glm::quat OculusManager::_calibrationOrientation;
 quint64 OculusManager::_calibrationStartTime;
 int OculusManager::_calibrationMessage = NULL;
-QString OculusManager::CALIBRATION_BILLBOARD_URL = "http://hifi-public.s3.amazonaws.com/images/hold-to-calibrate.svg";
-float OculusManager::CALIBRATION_BILLBOARD_SCALE = 2.f;
 
 #endif
 
@@ -191,7 +189,7 @@ void OculusManager::disconnect() {
 }
 
 #ifdef HAVE_LIBOVR
-void OculusManager::positionCalibrationBillboard(BillboardOverlay* billboard) {
+void OculusManager::positionCalibrationBillboard(Text3DOverlay* billboard) {
     glm::quat headOrientation = Application::getInstance()->getAvatar()->getHeadOrientation();
     headOrientation.x = 0;
     headOrientation.z = 0;
@@ -204,8 +202,9 @@ void OculusManager::positionCalibrationBillboard(BillboardOverlay* billboard) {
 
 #ifdef HAVE_LIBOVR
 void OculusManager::calibrate(glm::vec3 position, glm::quat orientation) {
+    static QString instructionMessage = "Hold still to calibrate";
     static QString progressMessage;
-    static BillboardOverlay* billboard;
+    static Text3DOverlay* billboard;
 
     switch (_calibrationState) {
 
@@ -235,9 +234,13 @@ void OculusManager::calibrate(glm::vec3 position, glm::quat orientation) {
                 if (!_calibrationMessage) {
                     qDebug() << "Hold still to calibrate HMD";
 
-                    billboard = new BillboardOverlay();
-                    billboard->setURL(CALIBRATION_BILLBOARD_URL);
-                    billboard->setScale(CALIBRATION_BILLBOARD_SCALE);
+                    billboard = new Text3DOverlay();
+                    billboard->setDimensions(glm::vec2(2.0f, 1.25f));
+                    billboard->setTopMargin(0.35f);
+                    billboard->setLeftMargin(0.28f);
+                    billboard->setText(instructionMessage);
+                    billboard->setAlpha(0.5f);
+                    billboard->setLineHeight(0.1f);
                     billboard->setIsFacingAvatar(false);
                     positionCalibrationBillboard(billboard);
 
@@ -275,7 +278,7 @@ void OculusManager::calibrate(glm::vec3 position, glm::quat orientation) {
                         } else {
                             progressMessage += ".";
                         }
-                        //qDebug() << progressMessage;  // Progress message ready for 3D text overlays.
+                        billboard->setText(instructionMessage + "\n\n" + progressMessage);
                     }
                 }
             } else {
diff --git a/interface/src/devices/OculusManager.h b/interface/src/devices/OculusManager.h
index dfe4a212b6..20e43d572c 100644
--- a/interface/src/devices/OculusManager.h
+++ b/interface/src/devices/OculusManager.h
@@ -18,7 +18,7 @@
 #endif
 
 #include "renderer/ProgramObject.h"
-#include "ui/overlays/BillboardOverlay.h"
+#include "ui/overlays/Text3DOverlay.h"
 
 const float DEFAULT_OCULUS_UI_ANGULAR_SIZE = 72.0f;
 
@@ -111,7 +111,7 @@ private:
         WAITING_FOR_ZERO_HELD,
         CALIBRATED
     };
-    static void positionCalibrationBillboard(BillboardOverlay* billboard);
+    static void positionCalibrationBillboard(Text3DOverlay* message);
     static float CALIBRATION_DELTA_MINIMUM_LENGTH;
     static float CALIBRATION_DELTA_MINIMUM_ANGLE;
     static float CALIBRATION_ZERO_MAXIMUM_LENGTH;
@@ -123,8 +123,6 @@ private:
     static glm::quat _calibrationOrientation;
     static quint64 _calibrationStartTime;
     static int _calibrationMessage;
-    static QString CALIBRATION_BILLBOARD_URL;
-    static float CALIBRATION_BILLBOARD_SCALE;
 
 #endif
     
diff --git a/interface/src/scripting/AudioDeviceScriptingInterface.cpp b/interface/src/scripting/AudioDeviceScriptingInterface.cpp
index 688b0942d5..bcb5fc308d 100644
--- a/interface/src/scripting/AudioDeviceScriptingInterface.cpp
+++ b/interface/src/scripting/AudioDeviceScriptingInterface.cpp
@@ -70,3 +70,11 @@ float AudioDeviceScriptingInterface::getInputVolume() {
 void AudioDeviceScriptingInterface::setInputVolume(float volume) {
     Application::getInstance()->getAudio()->setInputVolume(volume);
 }
+
+void AudioDeviceScriptingInterface::setReverb(bool reverb) {
+    Application::getInstance()->getAudio()->setReverb(reverb);
+}
+
+void AudioDeviceScriptingInterface::setReverbOptions(const AudioEffectOptions* options) {
+    Application::getInstance()->getAudio()->setReverbOptions(options);
+}
diff --git a/interface/src/scripting/AudioDeviceScriptingInterface.h b/interface/src/scripting/AudioDeviceScriptingInterface.h
index 62f1153a0b..45bdbc92e2 100644
--- a/interface/src/scripting/AudioDeviceScriptingInterface.h
+++ b/interface/src/scripting/AudioDeviceScriptingInterface.h
@@ -39,6 +39,8 @@ public slots:
 
     float getInputVolume();
     void setInputVolume(float volume);
+    void setReverb(bool reverb);
+    void setReverbOptions(const AudioEffectOptions* options);
 };
 
 #endif // hifi_AudioDeviceScriptingInterface_h
diff --git a/interface/src/ui/overlays/Text3DOverlay.h b/interface/src/ui/overlays/Text3DOverlay.h
index 855890e493..c49116ee0c 100644
--- a/interface/src/ui/overlays/Text3DOverlay.h
+++ b/interface/src/ui/overlays/Text3DOverlay.h
@@ -32,6 +32,7 @@ public:
     float getTopMargin() const { return _topMargin; }
     float getRightMargin() const { return _rightMargin; }
     float getBottomMargin() const { return _bottomMargin; }
+    bool getIsFacingAvatar() const { return _isFacingAvatar; }
     xColor getBackgroundColor();
 
     // setters
@@ -41,6 +42,7 @@ public:
     void setTopMargin(float margin) { _topMargin = margin; }
     void setRightMargin(float margin) { _rightMargin = margin; }
     void setBottomMargin(float margin) { _bottomMargin = margin; }
+    void setIsFacingAvatar(bool isFacingAvatar) { _isFacingAvatar = isFacingAvatar; }
 
     virtual void setProperties(const QScriptValue& properties);
 
diff --git a/libraries/audio/src/AudioEffectOptions.cpp b/libraries/audio/src/AudioEffectOptions.cpp
new file mode 100644
index 0000000000..480779afd2
--- /dev/null
+++ b/libraries/audio/src/AudioEffectOptions.cpp
@@ -0,0 +1,88 @@
+//
+//  AudioEffectOptions.cpp
+//  libraries/audio/src
+//
+//  Copyright 2013 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include "AudioEffectOptions.h"
+
+static const QString MAX_ROOM_SIZE_HANDLE = "maxRoomSize";
+static const QString ROOM_SIZE_HANDLE = "roomSize";
+static const QString REVERB_TIME_HANDLE = "reverbTime";
+static const QString DAMPIMG_HANDLE = "damping";
+static const QString SPREAD_HANDLE = "spread";
+static const QString INPUT_BANDWIDTH_HANDLE = "inputBandwidth";
+static const QString EARLY_LEVEL_HANDLE = "earlyLevel";
+static const QString TAIL_LEVEL_HANDLE = "tailLevel";
+static const QString DRY_LEVEL_HANDLE = "dryLevel";
+static const QString WET_LEVEL_HANDLE = "wetLevel";
+
+AudioEffectOptions::AudioEffectOptions(QScriptValue arguments) :
+    _maxRoomSize(50.0f),
+    _roomSize(50.0f),
+    _reverbTime(4.0f),
+    _damping(0.5f),
+    _spread(15.0f),
+    _inputBandwidth(0.75f),
+    _earlyLevel(-22.0f),
+    _tailLevel(-28.0f),
+    _dryLevel(0.0f),
+    _wetLevel(6.0f) {
+        if (arguments.property(MAX_ROOM_SIZE_HANDLE).isNumber()) {
+            _maxRoomSize = arguments.property(MAX_ROOM_SIZE_HANDLE).toNumber();
+        }
+        if (arguments.property(ROOM_SIZE_HANDLE).isNumber()) {
+            _roomSize = arguments.property(ROOM_SIZE_HANDLE).toNumber();
+        }
+        if (arguments.property(REVERB_TIME_HANDLE).isNumber()) {
+            _reverbTime = arguments.property(REVERB_TIME_HANDLE).toNumber();
+        }
+        if (arguments.property(DAMPIMG_HANDLE).isNumber()) {
+            _damping = arguments.property(DAMPIMG_HANDLE).toNumber();
+        }
+        if (arguments.property(SPREAD_HANDLE).isNumber()) {
+            _spread = arguments.property(SPREAD_HANDLE).toNumber();
+        }
+        if (arguments.property(INPUT_BANDWIDTH_HANDLE).isNumber()) {
+            _inputBandwidth = arguments.property(INPUT_BANDWIDTH_HANDLE).toNumber();
+        }
+        if (arguments.property(EARLY_LEVEL_HANDLE).isNumber()) {
+            _earlyLevel = arguments.property(EARLY_LEVEL_HANDLE).toNumber();
+        }
+        if (arguments.property(TAIL_LEVEL_HANDLE).isNumber()) {
+            _tailLevel = arguments.property(TAIL_LEVEL_HANDLE).toNumber();
+        }
+        if (arguments.property(DRY_LEVEL_HANDLE).isNumber()) {
+            _dryLevel = arguments.property(DRY_LEVEL_HANDLE).toNumber();
+        }
+        if (arguments.property(WET_LEVEL_HANDLE).isNumber()) {
+            _wetLevel = arguments.property(WET_LEVEL_HANDLE).toNumber();
+        }
+}
+
+AudioEffectOptions::AudioEffectOptions(const AudioEffectOptions &other) {
+    *this = other;
+}
+
+AudioEffectOptions& AudioEffectOptions::operator=(const AudioEffectOptions &other) {
+    _maxRoomSize = other._maxRoomSize;
+    _roomSize = other._roomSize;
+    _reverbTime = other._reverbTime;
+    _damping = other._damping;
+    _spread = other._spread;
+    _inputBandwidth = other._inputBandwidth;
+    _earlyLevel = other._earlyLevel;
+    _tailLevel = other._tailLevel;
+    _dryLevel = other._dryLevel;
+    _wetLevel = other._wetLevel;
+    
+    return *this;
+}
+
+QScriptValue AudioEffectOptions::constructor(QScriptContext* context, QScriptEngine* engine) {
+    return engine->newQObject(new AudioEffectOptions(context->argument(0)));
+}
diff --git a/libraries/audio/src/AudioEffectOptions.h b/libraries/audio/src/AudioEffectOptions.h
new file mode 100644
index 0000000000..97aac7c82c
--- /dev/null
+++ b/libraries/audio/src/AudioEffectOptions.h
@@ -0,0 +1,106 @@
+//
+//  AudioEffectOptions.h
+//  libraries/audio/src
+//
+//  Copyright 2013 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_AudioEffectOptions_h
+#define hifi_AudioEffectOptions_h
+
+#include <QObject>
+#include <QtScript/QScriptContext>
+#include <QtScript/QScriptEngine>
+
+class AudioEffectOptions : public QObject {
+    Q_OBJECT
+
+    // Meters Square
+    Q_PROPERTY(float maxRoomSize READ getMaxRoomSize WRITE setMaxRoomSize)
+    Q_PROPERTY(float roomSize READ getRoomSize WRITE setRoomSize)
+
+    // Seconds
+    Q_PROPERTY(float reverbTime READ getReverbTime WRITE setReverbTime)
+
+    // Ratio between 0 and 1
+    Q_PROPERTY(float damping READ getDamping WRITE setDamping)
+
+    // (?) Does not appear to be set externally very often
+    Q_PROPERTY(float spread READ getSpread WRITE setSpread)
+
+    // Ratio between 0 and 1
+    Q_PROPERTY(float inputBandwidth READ getInputBandwidth WRITE setInputBandwidth)
+
+    // in dB
+    Q_PROPERTY(float earlyLevel READ getEarlyLevel WRITE setEarlyLevel)
+    Q_PROPERTY(float tailLevel READ getTailLevel WRITE setTailLevel)
+    Q_PROPERTY(float dryLevel READ getDryLevel WRITE setDryLevel)
+    Q_PROPERTY(float wetLevel READ getWetLevel WRITE setWetLevel)
+
+public:
+    AudioEffectOptions(QScriptValue arguments = QScriptValue());
+    AudioEffectOptions(const AudioEffectOptions &other);
+    AudioEffectOptions& operator=(const AudioEffectOptions &other);
+
+    static QScriptValue constructor(QScriptContext* context, QScriptEngine* engine);
+
+    float getRoomSize() const { return _roomSize; }
+    void setRoomSize(float roomSize ) { _roomSize = roomSize; }
+
+    float getMaxRoomSize() const { return _maxRoomSize; }
+    void setMaxRoomSize(float maxRoomSize ) { _maxRoomSize = maxRoomSize; }
+
+    float getReverbTime() const { return _reverbTime; }
+    void setReverbTime(float reverbTime ) { _reverbTime = reverbTime; }
+
+    float getDamping() const { return _damping; }
+    void setDamping(float damping ) { _damping = damping; }
+
+    float getSpread() const { return _spread; }
+    void setSpread(float spread ) { _spread = spread; }
+
+    float getInputBandwidth() const { return _inputBandwidth; }
+    void setInputBandwidth(float inputBandwidth ) { _inputBandwidth = inputBandwidth; }
+
+    float getEarlyLevel() const { return _earlyLevel; }
+    void setEarlyLevel(float earlyLevel ) { _earlyLevel = earlyLevel; }
+
+    float getTailLevel() const { return _tailLevel; }
+    void setTailLevel(float tailLevel ) { _tailLevel = tailLevel; }
+
+    float getDryLevel() const { return _dryLevel; }
+    void setDryLevel(float dryLevel) { _dryLevel = dryLevel; }
+
+    float getWetLevel() const { return _wetLevel; }
+    void setWetLevel(float wetLevel) { _wetLevel = wetLevel; }
+
+private:
+    // http://wiki.audacityteam.org/wiki/GVerb#Instant_Reverberb_settings
+
+    // Meters Square
+    float _maxRoomSize;
+    float _roomSize;
+
+    // Seconds
+    float _reverbTime;
+
+    // Ratio between 0 and 1
+    float _damping;
+
+    // ? (Does not appear to be set externally very often)
+    float _spread;
+
+    // Ratio between 0 and 1
+    float _inputBandwidth;
+
+    // dB
+    float _earlyLevel;
+    float _tailLevel;
+    float _dryLevel;
+    float _wetLevel;
+};
+
+#endif // hifi_AudioEffectOptions_h
diff --git a/libraries/audio/src/InboundAudioStream.cpp b/libraries/audio/src/InboundAudioStream.cpp
index dda57d87da..59578951f8 100644
--- a/libraries/audio/src/InboundAudioStream.cpp
+++ b/libraries/audio/src/InboundAudioStream.cpp
@@ -44,7 +44,8 @@ InboundAudioStream::InboundAudioStream(int numFrameSamples, int numFramesCapacit
     _framesAvailableStat(),
     _currentJitterBufferFrames(0),
     _timeGapStatsForStatsPacket(0, STATS_FOR_STATS_PACKET_WINDOW_SECONDS),
-    _repetitionWithFade(settings._repetitionWithFade)
+    _repetitionWithFade(settings._repetitionWithFade),
+    _hasReverb(false)
 {
 }
 
@@ -162,9 +163,22 @@ int InboundAudioStream::parseData(const QByteArray& packet) {
 }
 
 int InboundAudioStream::parseStreamProperties(PacketType type, const QByteArray& packetAfterSeqNum, int& numAudioSamples) {
+    int read = 0;
+    if (type == PacketTypeMixedAudio) {
+        memcpy(&_hasReverb, packetAfterSeqNum.data() + read, sizeof(bool));
+        read += sizeof(bool);
+        
+        if (_hasReverb) {
+            memcpy(&_reverbTime, packetAfterSeqNum.data() + read, sizeof(float));
+            read += sizeof(float);
+            memcpy(&_wetLevel, packetAfterSeqNum.data() + read, sizeof(float));
+            read += sizeof(float);
+        }
+    }
+    
     // mixed audio packets do not have any info between the seq num and the audio data.
-    numAudioSamples = packetAfterSeqNum.size() / sizeof(int16_t);
-    return 0;
+    numAudioSamples = (packetAfterSeqNum.size() - read) / sizeof(int16_t);
+    return read;
 }
 
 int InboundAudioStream::parseAudioData(PacketType type, const QByteArray& packetAfterStreamProperties, int numAudioSamples) {
diff --git a/libraries/audio/src/InboundAudioStream.h b/libraries/audio/src/InboundAudioStream.h
index a395b1c6c8..3e69db0afb 100644
--- a/libraries/audio/src/InboundAudioStream.h
+++ b/libraries/audio/src/InboundAudioStream.h
@@ -154,6 +154,10 @@ public:
     int getOverflowCount() const { return _ringBuffer.getOverflowCount(); }
 
     int getPacketsReceived() const { return _incomingSequenceNumberStats.getReceived(); }
+    
+    bool hasReverb() const { return _hasReverb; }
+    float getRevebTime() const { return _reverbTime; }
+    float getWetLevel() const { return _wetLevel; }
 
 public slots:
     /// This function should be called every second for all the stats to function properly. If dynamic jitter buffers
@@ -243,6 +247,11 @@ protected:
     MovingMinMaxAvg<quint64> _timeGapStatsForStatsPacket;
 
     bool _repetitionWithFade;
+    
+    // Reverb properties
+    bool _hasReverb;
+    float _reverbTime;
+    float _wetLevel;
 };
 
 float calculateRepeatedFrameFadeFactor(int indexOfRepeat);
diff --git a/libraries/avatars/src/AvatarHashMap.cpp b/libraries/avatars/src/AvatarHashMap.cpp
index b74205c6b6..4f69eb2e3d 100644
--- a/libraries/avatars/src/AvatarHashMap.cpp
+++ b/libraries/avatars/src/AvatarHashMap.cpp
@@ -58,27 +58,21 @@ bool AvatarHashMap::containsAvatarWithDisplayName(const QString& displayName) {
 }
 
 AvatarData* AvatarHashMap::avatarWithDisplayName(const QString& displayName) {
-    AvatarHash::iterator avatarIterator = _avatarHash.begin();
-    while (avatarIterator != _avatarHash.end()) {
-        AvatarSharedPointer sharedAvatar = avatarIterator.value();
-        if (avatarIterator.value()->getDisplayName() == displayName) {
+    foreach(const AvatarSharedPointer& sharedAvatar, _avatarHash) {
+        if (sharedAvatar->getDisplayName() == displayName) {
             // this is a match
             // check if this avatar should still be around
             if (!shouldKillAvatar(sharedAvatar)) {
-                // we have a match, return true
+                // we have a match, return the AvatarData
                 return sharedAvatar.data();
             } else {
-                // we should remove this avatar, do that now
-                erase(avatarIterator);
+                // we should remove this avatar, but we might not be on a thread that is allowed
+                // so we just return NULL to the caller
+                return NULL;
             }
-            
-            break;
-        } else {
-            ++avatarIterator;
         }
     }
-    
-    // return false, no match
+        
     return NULL;
 }
 
diff --git a/libraries/metavoxels/src/DatagramSequencer.cpp b/libraries/metavoxels/src/DatagramSequencer.cpp
index be3d684a3d..d97ed67644 100644
--- a/libraries/metavoxels/src/DatagramSequencer.cpp
+++ b/libraries/metavoxels/src/DatagramSequencer.cpp
@@ -301,10 +301,10 @@ void DatagramSequencer::clearReliableChannel(QObject* object) {
 void DatagramSequencer::sendRecordAcknowledged(const SendRecord& record) {
     // stop acknowledging the recorded packets
     while (!_receiveRecords.isEmpty() && _receiveRecords.first().packetNumber <= record.lastReceivedPacketNumber) {
+        emit receiveAcknowledged(0);
         const ReceiveRecord& received = _receiveRecords.first();
         _inputStream.persistReadMappings(received.mappings);
         _receivedHighPriorityMessages -= received.newHighPriorityMessages;
-        emit receiveAcknowledged(0);
         _receiveRecords.removeFirst();
     }
     _outputStream.persistWriteMappings(record.mappings);
diff --git a/libraries/metavoxels/src/DatagramSequencer.h b/libraries/metavoxels/src/DatagramSequencer.h
index 9a1f5a4ae0..02fbd0f365 100644
--- a/libraries/metavoxels/src/DatagramSequencer.h
+++ b/libraries/metavoxels/src/DatagramSequencer.h
@@ -108,6 +108,9 @@ public:
     /// Returns the intput channel at the specified index, creating it if necessary.
     ReliableChannel* getReliableInputChannel(int index = 0);
     
+    /// Returns a reference to the stored receive mappings at the specified index.
+    const Bitstream::ReadMappings& getReadMappings(int index) const { return _receiveRecords.at(index).mappings; }
+    
     /// Adds stats for all reliable channels to the referenced variables.
     void addReliableChannelStats(int& sendProgress, int& sendTotal, int& receiveProgress, int& receiveTotal) const;
     
diff --git a/libraries/metavoxels/src/MetavoxelClientManager.cpp b/libraries/metavoxels/src/MetavoxelClientManager.cpp
index 09164d72c4..cc5d7ef29d 100644
--- a/libraries/metavoxels/src/MetavoxelClientManager.cpp
+++ b/libraries/metavoxels/src/MetavoxelClientManager.cpp
@@ -188,7 +188,9 @@ MetavoxelClient::MetavoxelClient(const SharedNodePointer& node, MetavoxelUpdater
     Endpoint(node, new PacketRecord(), new PacketRecord()),
     _updater(updater),
     _reliableDeltaChannel(NULL),
-    _reliableDeltaID(0) {
+    _reliableDeltaID(0),
+    _dummyInputStream(_dummyDataStream),
+    _dummyPacketNumber(0) {
     
     connect(_sequencer.getReliableInputChannel(RELIABLE_DELTA_CHANNEL_INDEX),
         SIGNAL(receivedMessage(const QVariant&, Bitstream&)), SLOT(handleMessage(const QVariant&, Bitstream&)));
@@ -234,9 +236,9 @@ PacketRecord* MetavoxelClient::getAcknowledgedReceiveRecord(int packetNumber) co
     if (lastAcknowledged->getPacketNumber() == packetNumber) {
         return lastAcknowledged;
     }
-    foreach (PacketRecord* record, _clearedReceiveRecords) {
-        if (record->getPacketNumber() == packetNumber) {
-            return record;
+    foreach (const ClearedReceiveRecord& record, _clearedReceiveRecords) {
+        if (record.first->getPacketNumber() == packetNumber) {
+            return record.first;
         }
     }
     return NULL;
@@ -257,8 +259,8 @@ void MetavoxelClient::recordReceive() {
     }
     _clearedSendRecords.clear();
     
-    foreach (PacketRecord* record, _clearedReceiveRecords) {
-        delete record;
+    foreach (const ClearedReceiveRecord& record, _clearedReceiveRecords) {
+        delete record.first;
     }
     _clearedReceiveRecords.clear();
 }
@@ -273,10 +275,16 @@ void MetavoxelClient::clearSendRecordsBefore(int index) {
 }
 
 void MetavoxelClient::clearReceiveRecordsBefore(int index) {
+    // copy the mappings on first call per packet
+    if (_sequencer.getIncomingPacketNumber() > _dummyPacketNumber) {
+        _dummyPacketNumber = _sequencer.getIncomingPacketNumber();
+        _dummyInputStream.copyPersistentMappings(_sequencer.getInputStream());
+    }
+    
     // move to cleared list
     QList<PacketRecord*>::iterator end = _receiveRecords.begin() + index + 1;
     for (QList<PacketRecord*>::const_iterator it = _receiveRecords.begin(); it != end; it++) {
-        _clearedReceiveRecords.append(*it);
+        _clearedReceiveRecords.append(ClearedReceiveRecord(*it, _sequencer.getReadMappings(index)));
     }
     _receiveRecords.erase(_receiveRecords.begin(), end);
 }
@@ -289,7 +297,6 @@ void MetavoxelClient::writeUpdateMessage(Bitstream& out) {
 void MetavoxelClient::handleMessage(const QVariant& message, Bitstream& in) {
     int userType = message.userType(); 
     if (userType == MetavoxelDeltaMessage::Type) {
-        PacketRecord* receiveRecord = getLastAcknowledgedReceiveRecord();
         if (_reliableDeltaChannel) {    
             MetavoxelData reference = _remoteData;
             MetavoxelLOD referenceLOD = _remoteDataLOD;
@@ -299,6 +306,7 @@ void MetavoxelClient::handleMessage(const QVariant& message, Bitstream& in) {
             _reliableDeltaChannel = NULL;
         
         } else {
+            PacketRecord* receiveRecord = getLastAcknowledgedReceiveRecord();
             _remoteData.readDelta(receiveRecord->getData(), receiveRecord->getLOD(), in,
                 _remoteDataLOD = getLastAcknowledgedSendRecord()->getLOD());
             in.reset();
@@ -319,8 +327,6 @@ void MetavoxelClient::handleMessage(const QVariant& message, Bitstream& in) {
         MetavoxelDeltaPendingMessage pending = message.value<MetavoxelDeltaPendingMessage>();
         if (pending.id > _reliableDeltaID) {
             _reliableDeltaID = pending.id;
-            _reliableDeltaChannel = _sequencer.getReliableInputChannel(RELIABLE_DELTA_CHANNEL_INDEX);
-            _reliableDeltaChannel->getBitstream().copyPersistentMappings(_sequencer.getInputStream());
             PacketRecord* sendRecord = getAcknowledgedSendRecord(pending.receivedPacketNumber);
             if (!sendRecord) {
                 qWarning() << "Missing send record for delta" << pending.receivedPacketNumber;
@@ -334,6 +340,20 @@ void MetavoxelClient::handleMessage(const QVariant& message, Bitstream& in) {
             }
             _remoteDataLOD = receiveRecord->getLOD();
             _remoteData = receiveRecord->getData();
+            
+            _reliableDeltaChannel = _sequencer.getReliableInputChannel(RELIABLE_DELTA_CHANNEL_INDEX);
+            if (receiveRecord == getLastAcknowledgedReceiveRecord()) {
+                _reliableDeltaChannel->getBitstream().copyPersistentMappings(_sequencer.getInputStream());
+                
+            } else {
+                _reliableDeltaChannel->getBitstream().copyPersistentMappings(_dummyInputStream);
+                foreach (const ClearedReceiveRecord& record, _clearedReceiveRecords) {
+                    _reliableDeltaChannel->getBitstream().persistReadMappings(record.second);
+                    if (record.first == receiveRecord) {
+                        break;
+                    }
+                }
+            }
         }
     } else {
         Endpoint::handleMessage(message, in);
diff --git a/libraries/metavoxels/src/MetavoxelClientManager.h b/libraries/metavoxels/src/MetavoxelClientManager.h
index 0a32f2986d..adab59e0ff 100644
--- a/libraries/metavoxels/src/MetavoxelClientManager.h
+++ b/libraries/metavoxels/src/MetavoxelClientManager.h
@@ -145,8 +145,13 @@ protected:
     MetavoxelData _dataCopy;
     QReadWriteLock _dataCopyLock;
     
+    QDataStream _dummyDataStream;
+    Bitstream _dummyInputStream;
+    int _dummyPacketNumber;
     QList<PacketRecord*> _clearedSendRecords;
-    QList<PacketRecord*> _clearedReceiveRecords;
+    
+    typedef QPair<PacketRecord*, Bitstream::ReadMappings> ClearedReceiveRecord;
+    QList<ClearedReceiveRecord> _clearedReceiveRecords;
 };
 
 #endif // hifi_MetavoxelClientManager_h
diff --git a/libraries/metavoxels/src/MetavoxelMessages.cpp b/libraries/metavoxels/src/MetavoxelMessages.cpp
index 299ffbbb80..d9c60f3f12 100644
--- a/libraries/metavoxels/src/MetavoxelMessages.cpp
+++ b/libraries/metavoxels/src/MetavoxelMessages.cpp
@@ -701,8 +701,7 @@ int VoxelMaterialSpannerEditVisitor::visit(MetavoxelInfo& info) {
     int sizeY = (int)overlap.maximum.y - minY + 1;
     int sizeZ = (int)overlap.maximum.z - minZ + 1;
     
-    QRgb rgb = _color.rgba();
-    bool flipped = (qAlpha(rgb) == 0);
+    bool flipped = false;
     float step = 1.0f / scale;
     glm::vec3 position(0.0f, 0.0f, info.minimum.z + minZ * step);
     if (_spanner->hasOwnColors()) {
@@ -720,6 +719,8 @@ int VoxelMaterialSpannerEditVisitor::visit(MetavoxelInfo& info) {
             }
         }
     } else {
+        QRgb rgb = _color.rgba();
+        flipped = (qAlpha(rgb) == 0);
         for (QRgb* destZ = colorContents.data() + minZ * VOXEL_BLOCK_AREA + minY * VOXEL_BLOCK_SAMPLES + minX,
                 *endZ = destZ + sizeZ * VOXEL_BLOCK_AREA; destZ != endZ; destZ += VOXEL_BLOCK_AREA, position.z += step) {
             position.y = info.minimum.y + minY * step;
diff --git a/libraries/script-engine/CMakeLists.txt b/libraries/script-engine/CMakeLists.txt
index 7073280ee5..166ee8c50e 100644
--- a/libraries/script-engine/CMakeLists.txt
+++ b/libraries/script-engine/CMakeLists.txt
@@ -5,7 +5,7 @@ setup_hifi_library(Gui Network Script Widgets)
 
 include_glm()
 
-link_hifi_libraries(shared octree voxels fbx entities animation)
+link_hifi_libraries(shared octree voxels fbx entities animation audio)
 
 # call macro to link our dependencies and bubble them up via a property on our target
 link_shared_dependencies()
diff --git a/libraries/script-engine/src/ScriptEngine.cpp b/libraries/script-engine/src/ScriptEngine.cpp
index 93da900055..660a6ec560 100644
--- a/libraries/script-engine/src/ScriptEngine.cpp
+++ b/libraries/script-engine/src/ScriptEngine.cpp
@@ -17,6 +17,7 @@
 #include <QtNetwork/QNetworkReply>
 #include <QScriptEngine>
 
+#include <AudioEffectOptions.h>
 #include <AudioInjector.h>
 #include <AudioRingBuffer.h>
 #include <AvatarData.h>
@@ -277,6 +278,9 @@ void ScriptEngine::init() {
 
     QScriptValue localVoxelsValue = scriptValueFromQMetaObject<LocalVoxels>();
     globalObject().setProperty("LocalVoxels", localVoxelsValue);
+
+    QScriptValue audioEffectOptionsConstructorValue = newFunction(AudioEffectOptions::constructor);
+    globalObject().setProperty("AudioEffectOptions", audioEffectOptionsConstructorValue);
     
     qScriptRegisterMetaType(this, injectorToScriptValue, injectorFromScriptValue);
     qScriptRegisterMetaType(this, inputControllerToScriptValue, inputControllerFromScriptValue);
diff --git a/libraries/script-engine/src/UndoStackScriptingInterface.cpp b/libraries/script-engine/src/UndoStackScriptingInterface.cpp
new file mode 100644
index 0000000000..ed0f4d563d
--- /dev/null
+++ b/libraries/script-engine/src/UndoStackScriptingInterface.cpp
@@ -0,0 +1,58 @@
+//
+//  UndoStackScriptingInterface.cpp
+//  libraries/script-engine/src
+//
+//  Created by Ryan Huffman on 10/22/14.
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include <QDebug>
+#include <QScriptValue>
+#include <QScriptValueList>
+#include <QScriptEngine>
+
+#include "UndoStackScriptingInterface.h"
+
+UndoStackScriptingInterface::UndoStackScriptingInterface(QUndoStack* undoStack) : _undoStack(undoStack) {
+}
+
+void UndoStackScriptingInterface::pushCommand(QScriptValue undoFunction, QScriptValue undoData,
+                                              QScriptValue redoFunction, QScriptValue redoData) {
+    if (undoFunction.engine()) {
+        ScriptUndoCommand* undoCommand = new ScriptUndoCommand(undoFunction, undoData, redoFunction, redoData);
+        undoCommand->moveToThread(undoFunction.engine()->thread());
+        _undoStack->push(undoCommand);
+    }
+}
+
+ScriptUndoCommand::ScriptUndoCommand(QScriptValue undoFunction, QScriptValue undoData,
+                                     QScriptValue redoFunction, QScriptValue redoData) :
+    _undoFunction(undoFunction),
+    _undoData(undoData),
+    _redoFunction(redoFunction),
+    _redoData(redoData) {
+}
+
+void ScriptUndoCommand::undo() {
+    QMetaObject::invokeMethod(this, "doUndo");
+}
+
+void ScriptUndoCommand::redo() {
+    QMetaObject::invokeMethod(this, "doRedo");
+}
+
+void ScriptUndoCommand::doUndo() {
+    QScriptValueList args;
+    args << _undoData;
+    _undoFunction.call(QScriptValue(), args);
+}
+
+
+void ScriptUndoCommand::doRedo() {
+    QScriptValueList args;
+    args << _redoData;
+    _redoFunction.call(QScriptValue(), args);
+}
diff --git a/libraries/script-engine/src/UndoStackScriptingInterface.h b/libraries/script-engine/src/UndoStackScriptingInterface.h
new file mode 100644
index 0000000000..835e5dfff4
--- /dev/null
+++ b/libraries/script-engine/src/UndoStackScriptingInterface.h
@@ -0,0 +1,52 @@
+//
+//  UndoStackScriptingInterface.h
+//  libraries/script-engine/src
+//
+//  Created by Ryan Huffman on 10/22/14.
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_UndoStackScriptingInterface_h
+#define hifi_UndoStackScriptingInterface_h
+
+#include <QUndoCommand>
+#include <QUndoStack>
+#include <QScriptValue>
+
+class UndoStackScriptingInterface : public QObject {
+    Q_OBJECT
+public:
+    UndoStackScriptingInterface(QUndoStack* undoStack);
+
+public slots:
+    void pushCommand(QScriptValue undoFunction, QScriptValue undoData, QScriptValue redoFunction, QScriptValue redoData);
+
+private:
+    QUndoStack* _undoStack;
+};
+
+class ScriptUndoCommand : public QObject, public QUndoCommand {
+    Q_OBJECT
+public:
+    ScriptUndoCommand(QScriptValue undoFunction, QScriptValue undoData, QScriptValue redoFunction, QScriptValue redoData);
+
+    virtual void undo();
+    virtual void redo();
+    virtual bool mergeWith(const QUndoCommand* command) { return false; }
+    virtual int id() const { return -1; }
+
+public slots:
+    void doUndo();
+    void doRedo();
+
+private:
+    QScriptValue _undoFunction;
+    QScriptValue _undoData;
+    QScriptValue _redoFunction;
+    QScriptValue _redoData;
+};
+
+#endif // hifi_UndoStackScriptingInterface_h