diff --git a/assignment-client/src/audio/AudioMixer.cpp b/assignment-client/src/audio/AudioMixer.cpp
index f67c54239e..201e24d4b9 100644
--- a/assignment-client/src/audio/AudioMixer.cpp
+++ b/assignment-client/src/audio/AudioMixer.cpp
@@ -97,6 +97,7 @@ AudioMixer::AudioMixer(ReceivedMessage& message) :
             PacketType::RadiusIgnoreRequest,
             PacketType::RequestsDomainListData,
             PacketType::PerAvatarGainSet,
+            PacketType::InjectorGainSet,
             PacketType::AudioSoloRequest },
             this, "queueAudioPacket");
 
diff --git a/assignment-client/src/audio/AudioMixerClientData.cpp b/assignment-client/src/audio/AudioMixerClientData.cpp
index 90698bfac8..b8d3ec62a6 100644
--- a/assignment-client/src/audio/AudioMixerClientData.cpp
+++ b/assignment-client/src/audio/AudioMixerClientData.cpp
@@ -92,6 +92,9 @@ int AudioMixerClientData::processPackets(ConcurrentAddedStreams& addedStreams) {
             case PacketType::PerAvatarGainSet:
                 parsePerAvatarGainSet(*packet, node);
                 break;
+            case PacketType::InjectorGainSet:
+                parseInjectorGainSet(*packet, node);
+                break;
             case PacketType::NodeIgnoreRequest:
                 parseNodeIgnoreRequest(packet, node);
                 break;
@@ -205,6 +208,17 @@ void AudioMixerClientData::parsePerAvatarGainSet(ReceivedMessage& message, const
     }
 }
 
+void AudioMixerClientData::parseInjectorGainSet(ReceivedMessage& message, const SharedNodePointer& node) {
+    QUuid uuid = node->getUUID();
+
+    uint8_t packedGain;
+    message.readPrimitive(&packedGain);
+    float gain = unpackFloatGainFromByte(packedGain);
+
+    setMasterInjectorGain(gain);
+    qCDebug(audio) << "Setting MASTER injector gain for " << uuid << " to " << gain;
+}
+
 void AudioMixerClientData::setGainForAvatar(QUuid nodeID, float gain) {
     auto it = std::find_if(_streams.active.cbegin(), _streams.active.cend(), [nodeID](const MixableStream& mixableStream){
         return mixableStream.nodeStreamID.nodeID == nodeID && mixableStream.nodeStreamID.streamID.isNull();
diff --git a/assignment-client/src/audio/AudioMixerClientData.h b/assignment-client/src/audio/AudioMixerClientData.h
index f9d113c53d..4a1ca7f9b5 100644
--- a/assignment-client/src/audio/AudioMixerClientData.h
+++ b/assignment-client/src/audio/AudioMixerClientData.h
@@ -63,6 +63,7 @@ public:
     void negotiateAudioFormat(ReceivedMessage& message, const SharedNodePointer& node);
     void parseRequestsDomainListData(ReceivedMessage& message);
     void parsePerAvatarGainSet(ReceivedMessage& message, const SharedNodePointer& node);
+    void parseInjectorGainSet(ReceivedMessage& message, const SharedNodePointer& node);
     void parseNodeIgnoreRequest(QSharedPointer<ReceivedMessage> message, const SharedNodePointer& node);
     void parseRadiusIgnoreRequest(QSharedPointer<ReceivedMessage> message, const SharedNodePointer& node);
     void parseSoloRequest(QSharedPointer<ReceivedMessage> message, const SharedNodePointer& node);
diff --git a/libraries/networking/src/udt/PacketHeaders.h b/libraries/networking/src/udt/PacketHeaders.h
index 0ec7c40ca4..413ff14b17 100644
--- a/libraries/networking/src/udt/PacketHeaders.h
+++ b/libraries/networking/src/udt/PacketHeaders.h
@@ -57,7 +57,7 @@ public:
         ICEServerQuery,
         OctreeStats,
         SetAvatarTraits,
-        UNUSED_PACKET_TYPE,
+        InjectorGainSet,
         AssignmentClientStatus,
         NoisyMute,
         AvatarIdentity,