diff --git a/BREAKING-CHANGES.txt b/BREAKING-CHANGES.txt
index 955d7ccc11..0d0586b399 100644
--- a/BREAKING-CHANGES.txt
+++ b/BREAKING-CHANGES.txt
@@ -4,6 +4,30 @@ JUCE breaking changes
 Develop
 =======
 
+Change
+------
+AudioProcessorListener::audioProcessorChanged gained a new parameter describing
+the nature of any change.
+
+Possible Issues
+---------------
+Code using the old function signature will not build until updated to use
+the new signature.
+
+Workaround
+----------
+Listeners should add the new parameter to any overrides of
+audioProcessorChanged.
+
+Rationale
+---------
+The new function signature means that wrappers can be smarter about the
+requests that they make to hosts whenever some aspect of the processor changes.
+In particular, plugin wrappers can now distinguish between changes to latency,
+parameter attributes, and the current program. This means that hosts will no
+longer assume parameters have changed when `setLatencySamples` is called.
+
+
 Change
 ------
 CharacterFunctions::readDoubleValue now returns values consistent with other
diff --git a/extras/AudioPluginHost/Source/Plugins/PluginGraph.h b/extras/AudioPluginHost/Source/Plugins/PluginGraph.h
index 59217f0e0e..e97c4b6193 100644
--- a/extras/AudioPluginHost/Source/Plugins/PluginGraph.h
+++ b/extras/AudioPluginHost/Source/Plugins/PluginGraph.h
@@ -60,7 +60,7 @@ public:
 
     //==============================================================================
     void audioProcessorParameterChanged (AudioProcessor*, int, float) override {}
-    void audioProcessorChanged (AudioProcessor*) override { changed(); }
+    void audioProcessorChanged (AudioProcessor*, const ChangeDetails&) override { changed(); }
 
     //==============================================================================
     std::unique_ptr<XmlElement> createXml() const;
diff --git a/extras/AudioPluginHost/Source/UI/PluginWindow.h b/extras/AudioPluginHost/Source/UI/PluginWindow.h
index 7cec3d810b..36bc0f2728 100644
--- a/extras/AudioPluginHost/Source/UI/PluginWindow.h
+++ b/extras/AudioPluginHost/Source/UI/PluginWindow.h
@@ -287,7 +287,7 @@ private:
             }
 
             void refresh() override {}
-            void audioProcessorChanged (AudioProcessor*) override {}
+            void audioProcessorChanged (AudioProcessor*, const ChangeDetails&) override {}
             void audioProcessorParameterChanged (AudioProcessor*, int, float) override {}
 
             AudioProcessor& owner;
diff --git a/modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp b/modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp
index 95a0913245..3c01ac8a4c 100644
--- a/modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp
@@ -1085,24 +1085,28 @@ namespace AAXClasses
                 SetParameterNormalizedValue (paramID, (double) newValue);
         }
 
-        void audioProcessorChanged (AudioProcessor* processor) override
+        void audioProcessorChanged (AudioProcessor* processor, const ChangeDetails& details) override
         {
             ++mNumPlugInChanges;
 
-            auto numParameters = juceParameters.getNumParameters();
-
-            for (int i = 0; i < numParameters; ++i)
+            if (details.parameterInfoChanged)
             {
-                if (auto* p = mParameterManager.GetParameterByID (getAAXParamIDFromJuceIndex (i)))
-                {
-                    auto newName = juceParameters.getParamForIndex (i)->getName (31);
+                auto numParameters = juceParameters.getNumParameters();
 
-                    if (p->Name() != newName.toRawUTF8())
-                        p->SetName (AAX_CString (newName.toRawUTF8()));
+                for (int i = 0; i < numParameters; ++i)
+                {
+                    if (auto* p = mParameterManager.GetParameterByID (getAAXParamIDFromJuceIndex (i)))
+                    {
+                        auto newName = juceParameters.getParamForIndex (i)->getName (31);
+
+                        if (p->Name() != newName.toRawUTF8())
+                            p->SetName (AAX_CString (newName.toRawUTF8()));
+                    }
                 }
             }
 
-            check (Controller()->SetSignalLatency (processor->getLatencySamples()));
+            if (details.latencyChanged)
+                check (Controller()->SetSignalLatency (processor->getLatencySamples()));
         }
 
         void audioProcessorParameterChangeGestureBegin (AudioProcessor*, int parameterIndex) override
diff --git a/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm b/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
index 60d9bad8ef..6048cc8cea 100644
--- a/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
+++ b/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
@@ -1166,16 +1166,24 @@ public:
         sendAUEvent (kAudioUnitEvent_EndParameterChangeGesture, index);
     }
 
-    void audioProcessorChanged (AudioProcessor*) override
+    void audioProcessorChanged (AudioProcessor*, const ChangeDetails& details) override
     {
-        PropertyChanged (kAudioUnitProperty_Latency,       kAudioUnitScope_Global, 0);
-        PropertyChanged (kAudioUnitProperty_ParameterList, kAudioUnitScope_Global, 0);
-        PropertyChanged (kAudioUnitProperty_ParameterInfo, kAudioUnitScope_Global, 0);
-        PropertyChanged (kAudioUnitProperty_ClassInfo,     kAudioUnitScope_Global, 0);
+        if (details.latencyChanged)
+            PropertyChanged (kAudioUnitProperty_Latency, kAudioUnitScope_Global, 0);
 
-        refreshCurrentPreset();
+        if (details.parameterInfoChanged)
+        {
+            PropertyChanged (kAudioUnitProperty_ParameterList, kAudioUnitScope_Global, 0);
+            PropertyChanged (kAudioUnitProperty_ParameterInfo, kAudioUnitScope_Global, 0);
+        }
 
-        PropertyChanged (kAudioUnitProperty_PresentPreset, kAudioUnitScope_Global, 0);
+        PropertyChanged (kAudioUnitProperty_ClassInfo, kAudioUnitScope_Global, 0);
+
+        if (details.programChanged)
+        {
+            refreshCurrentPreset();
+            PropertyChanged (kAudioUnitProperty_PresentPreset, kAudioUnitScope_Global, 0);
+        }
     }
 
     //==============================================================================
diff --git a/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm b/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
index 42718f2039..8f3106ced3 100644
--- a/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
+++ b/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
@@ -914,7 +914,7 @@ public:
    #endif
 
     //==============================================================================
-    void audioProcessorChanged (AudioProcessor* processor) override
+    void audioProcessorChanged (AudioProcessor* processor, const ChangeDetails&) override
     {
         ignoreUnused (processor);
 
diff --git a/modules/juce_audio_plugin_client/RTAS/juce_RTAS_Wrapper.cpp b/modules/juce_audio_plugin_client/RTAS/juce_RTAS_Wrapper.cpp
index c7d780291a..7836bf1179 100644
--- a/modules/juce_audio_plugin_client/RTAS/juce_RTAS_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/RTAS/juce_RTAS_Wrapper.cpp
@@ -790,7 +790,7 @@ public:
         ReleaseControl (index + 2);
     }
 
-    void audioProcessorChanged (AudioProcessor*) override
+    void audioProcessorChanged (AudioProcessor*, const ChangeDetails&) override
     {
         // xxx is there an RTAS equivalent?
     }
diff --git a/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp b/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp
index 290837a0c7..c826f0b9df 100644
--- a/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp
@@ -254,7 +254,6 @@ struct AbletonLiveHostSpecific
 class JuceVSTWrapper  : public AudioProcessorListener,
                         public AudioPlayHead,
                         private Timer,
-                        private AsyncUpdater,
                         private AudioProcessorParameter::Listener
 {
 private:
@@ -802,19 +801,9 @@ public:
 
     void parameterGestureChanged (int, bool) override {}
 
-    void audioProcessorChanged (AudioProcessor*) override
+    void audioProcessorChanged (AudioProcessor*, const ChangeDetails& details) override
     {
-        vstEffect.initialDelay = processor->getLatencySamples();
-        triggerAsyncUpdate();
-    }
-
-    void handleAsyncUpdate() override
-    {
-        if (hostCallback != nullptr)
-        {
-            hostCallback (&vstEffect, Vst2::audioMasterUpdateDisplay, 0, 0, nullptr, 0);
-            hostCallback (&vstEffect, Vst2::audioMasterIOChanged,     0, 0, nullptr, 0);
-        }
+        hostChangeUpdater.update (details);
     }
 
     bool getPinProperties (Vst2::VstPinProperties& properties, bool direction, int index) const
@@ -1398,6 +1387,33 @@ public:
 
     //==============================================================================
 private:
+    struct HostChangeUpdater  : private AsyncUpdater
+    {
+        explicit HostChangeUpdater (JuceVSTWrapper& o)  : owner (o) {}
+        ~HostChangeUpdater() override  { cancelPendingUpdate(); }
+
+        void update (const ChangeDetails& details)
+        {
+            if (details.latencyChanged)
+                owner.vstEffect.initialDelay = owner.processor->getLatencySamples();
+
+            if (details.parameterInfoChanged || details.programChanged)
+                triggerAsyncUpdate();
+        }
+
+    private:
+        void handleAsyncUpdate() override
+        {
+            if (auto* callback = owner.hostCallback)
+            {
+                callback (&owner.vstEffect, Vst2::audioMasterUpdateDisplay, 0, 0, nullptr, 0);
+                callback (&owner.vstEffect, Vst2::audioMasterIOChanged,     0, 0, nullptr, 0);
+            }
+        }
+
+        JuceVSTWrapper& owner;
+    };
+
     static JuceVSTWrapper* getWrapper (Vst2::AEffect* v) noexcept  { return static_cast<JuceVSTWrapper*> (v->object); }
 
     bool isProcessLevelOffline()
@@ -2121,6 +2137,8 @@ private:
 
     ThreadLocalValue<bool> inParameterChangedCallback;
 
+    HostChangeUpdater hostChangeUpdater { *this };
+
     //==============================================================================
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (JuceVSTWrapper)
 };
diff --git a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
index 640c374b05..ed779b3b7b 100644
--- a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
@@ -960,18 +960,21 @@ public:
         paramChanged (audioProcessor->getVSTParamIDForIndex (index), newValue);
     }
 
-    void audioProcessorChanged (AudioProcessor*) override
+    void audioProcessorChanged (AudioProcessor*, const ChangeDetails& details) override
     {
         int32 flags = 0;
 
-        for (int32 i = 0; i < parameters.getParameterCount(); ++i)
-            if (auto* param = dynamic_cast<Param*> (parameters.getParameterByIndex (i)))
-                if (param->updateParameterInfo() && (flags & Vst::kParamTitlesChanged) == 0)
-                    flags |= Vst::kParamTitlesChanged;
+        if (details.parameterInfoChanged)
+        {
+            for (int32 i = 0; i < parameters.getParameterCount(); ++i)
+                if (auto* param = dynamic_cast<Param*> (parameters.getParameterByIndex (i)))
+                    if (param->updateParameterInfo() && (flags & Vst::kParamTitlesChanged) == 0)
+                        flags |= Vst::kParamTitlesChanged;
+        }
 
         if (auto* pluginInstance = getPluginInstance())
         {
-            if (audioProcessor->getProgramParameter() != nullptr)
+            if (details.programChanged && audioProcessor->getProgramParameter() != nullptr)
             {
                 auto currentProgram = pluginInstance->getCurrentProgram();
                 auto paramValue = roundToInt (EditController::normalizedParamToPlain (JuceAudioProcessor::paramPreset,
@@ -990,7 +993,7 @@ public:
 
             auto latencySamples = pluginInstance->getLatencySamples();
 
-            if (latencySamples != lastLatencySamples)
+            if (details.latencyChanged && latencySamples != lastLatencySamples)
             {
                 flags |= Vst::kLatencyChanged;
                 lastLatencySamples = latencySamples;
@@ -1116,7 +1119,7 @@ private:
             initialiseMidiControllerMappings();
            #endif
 
-            audioProcessorChanged (pluginInstance);
+            audioProcessorChanged (pluginInstance, ChangeDetails().withParameterInfoChanged (true));
         }
     }
 
diff --git a/modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm b/modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm
index d5c65b7b23..9aa4a338e9 100644
--- a/modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm
+++ b/modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm
@@ -1822,12 +1822,12 @@ private:
             default:
                 if (event.mArgument.mProperty.mPropertyID == kAudioUnitProperty_ParameterList)
                 {
-                    updateHostDisplay();
+                    updateHostDisplay (AudioProcessorListener::ChangeDetails().withParameterInfoChanged (true));
                 }
                 else if (event.mArgument.mProperty.mPropertyID == kAudioUnitProperty_PresentPreset)
                 {
                     sendAllParametersChangedEvents();
-                    updateHostDisplay();
+                    updateHostDisplay (AudioProcessorListener::ChangeDetails().withProgramChanged (true));
                 }
                 else if (event.mArgument.mProperty.mPropertyID == kAudioUnitProperty_Latency)
                 {
diff --git a/modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp b/modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp
index c13c3fd5c0..7ccdcadff3 100644
--- a/modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp
+++ b/modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp
@@ -3179,7 +3179,9 @@ tresult VST3HostContext::restartComponent (Steinberg::int32 flags)
             if (plugin->processor != nullptr)
                 plugin->setLatencySamples (jmax (0, (int) plugin->processor->getLatencySamples()));
 
-        plugin->updateHostDisplay();
+        plugin->updateHostDisplay (AudioProcessorListener::ChangeDetails().withProgramChanged (true)
+                                                                          .withParameterInfoChanged (true));
+
         return kResultTrue;
     }
 
diff --git a/modules/juce_audio_processors/format_types/juce_VSTPluginFormat.cpp b/modules/juce_audio_processors/format_types/juce_VSTPluginFormat.cpp
index 1a51ae11d2..70b75f686b 100644
--- a/modules/juce_audio_processors/format_types/juce_VSTPluginFormat.cpp
+++ b/modules/juce_audio_processors/format_types/juce_VSTPluginFormat.cpp
@@ -1602,8 +1602,8 @@ struct VSTPluginInstance     : public AudioPluginInstance,
 
     void handleAsyncUpdate() override
     {
-        // indicates that something about the plugin has changed..
-        updateHostDisplay();
+        updateHostDisplay (AudioProcessorListener::ChangeDetails().withProgramChanged (true)
+                                                                  .withParameterInfoChanged (true));
     }
 
     pointer_sized_int handleCallback (int32 opcode, int32 index, pointer_sized_int value, void* ptr, float opt)
diff --git a/modules/juce_audio_processors/processors/juce_AudioProcessor.cpp b/modules/juce_audio_processors/processors/juce_AudioProcessor.cpp
index 1c23e9d3ec..040accf2e5 100644
--- a/modules/juce_audio_processors/processors/juce_AudioProcessor.cpp
+++ b/modules/juce_audio_processors/processors/juce_AudioProcessor.cpp
@@ -410,7 +410,7 @@ void AudioProcessor::setLatencySamples (int newLatency)
     if (latencySamples != newLatency)
     {
         latencySamples = newLatency;
-        updateHostDisplay();
+        updateHostDisplay (AudioProcessorListener::ChangeDetails().withLatencyChanged (true));
     }
 }
 
@@ -421,11 +421,11 @@ AudioProcessorListener* AudioProcessor::getListenerLocked (int index) const noex
     return listeners[index];
 }
 
-void AudioProcessor::updateHostDisplay()
+void AudioProcessor::updateHostDisplay (const AudioProcessorListener::ChangeDetails& details)
 {
     for (int i = listeners.size(); --i >= 0;)
         if (auto l = getListenerLocked (i))
-            l->audioProcessorChanged (this);
+            l->audioProcessorChanged (this, details);
 }
 
 void AudioProcessor::checkForDuplicateParamID (AudioProcessorParameter* param)
diff --git a/modules/juce_audio_processors/processors/juce_AudioProcessor.h b/modules/juce_audio_processors/processors/juce_AudioProcessor.h
index 27e4338640..39eac82112 100644
--- a/modules/juce_audio_processors/processors/juce_AudioProcessor.h
+++ b/modules/juce_audio_processors/processors/juce_AudioProcessor.h
@@ -991,7 +991,7 @@ public:
         It sends a hint to the host that something like the program, number of parameters,
         etc, has changed, and that it should update itself.
     */
-    void updateHostDisplay();
+    void updateHostDisplay (const AudioProcessorListener::ChangeDetails& details = {});
 
     //==============================================================================
     /** Adds a parameter to the AudioProcessor.
diff --git a/modules/juce_audio_processors/processors/juce_AudioProcessorListener.h b/modules/juce_audio_processors/processors/juce_AudioProcessorListener.h
index 7e075b394a..9a83d06c83 100644
--- a/modules/juce_audio_processors/processors/juce_AudioProcessorListener.h
+++ b/modules/juce_audio_processors/processors/juce_AudioProcessorListener.h
@@ -57,6 +57,28 @@ public:
                                                  int parameterIndex,
                                                  float newValue) = 0;
 
+    /** Provides details about aspects of an AudioProcessor which have changed.
+    */
+    struct JUCE_API  ChangeDetails
+    {
+        bool latencyChanged = false;
+        bool parameterInfoChanged = false;
+        bool programChanged = false;
+
+        ChangeDetails withLatencyChanged       (bool b) const noexcept { return with (&ChangeDetails::latencyChanged,       b); }
+        ChangeDetails withParameterInfoChanged (bool b) const noexcept { return with (&ChangeDetails::parameterInfoChanged, b); }
+        ChangeDetails withProgramChanged       (bool b) const noexcept { return with (&ChangeDetails::programChanged,       b); }
+
+    private:
+        template <typename Member, typename Value>
+        ChangeDetails with (Member&& member, Value&& value) const noexcept
+        {
+            auto copy = *this;
+            copy.*member = std::forward<Value> (value);
+            return copy;
+        }
+    };
+
     /** Called to indicate that something else in the plugin has changed, like its
         program, number of parameters, etc.
 
@@ -67,7 +89,7 @@ public:
         to trigger an AsyncUpdater or ChangeBroadcaster which you can respond to later on the
         message thread.
     */
-    virtual void audioProcessorChanged (AudioProcessor* processor) = 0;
+    virtual void audioProcessorChanged (AudioProcessor* processor, const ChangeDetails& details) = 0;
 
     /** Indicates that a parameter change gesture has started.
 
diff --git a/modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp b/modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp
index 1d1c0df1ce..9018ad17c9 100644
--- a/modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp
+++ b/modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp
@@ -73,7 +73,7 @@ private:
             parameterValueHasChanged = 1;
     }
 
-    void audioProcessorChanged (AudioProcessor*) override {}
+    void audioProcessorChanged (AudioProcessor*, const ChangeDetails&) override {}
 
     //==============================================================================
     void timerCallback() override