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 88a2f66f8e..570763f107 100644
--- a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
@@ -2825,11 +2825,29 @@ public:
                 info.channelCount = bus->getLastEnabledLayout().size();
                 toString128 (info.name, bus->getName());
 
-               #if JucePlugin_IsSynth
-                info.busType = (dir == Vst::kInput && index > 0 ? Vst::kAux : Vst::kMain);
-               #else
-                info.busType = (index == 0 ? Vst::kMain : Vst::kAux);
-               #endif
+                info.busType = [&]
+                {
+                    const auto isFirstBus = (index == 0);
+
+                    if (dir == Vst::kInput)
+                    {
+                        if (isFirstBus)
+                        {
+                            if (auto* extensions = dynamic_cast<VST3ClientExtensions*> (pluginInstance))
+                                return extensions->getPluginHasMainInput() ? Vst::kMain : Vst::kAux;
+
+                            return Vst::kMain;
+                        }
+
+                        return Vst::kAux;
+                    }
+
+                   #if JucePlugin_IsSynth
+                    return Vst::kMain;
+                   #else
+                    return isFirstBus ? Vst::kMain : Vst::kAux;
+                   #endif
+                }();
 
                #ifdef JucePlugin_PreferredChannelConfigurations
                 info.flags = Vst::BusInfo::kDefaultActive;
diff --git a/modules/juce_audio_processors/utilities/juce_VST3ClientExtensions.h b/modules/juce_audio_processors/utilities/juce_VST3ClientExtensions.h
index 32afeeb2d6..ffbf0056dc 100644
--- a/modules/juce_audio_processors/utilities/juce_VST3ClientExtensions.h
+++ b/modules/juce_audio_processors/utilities/juce_VST3ClientExtensions.h
@@ -82,6 +82,14 @@ struct VST3ClientExtensions
         called - this function may not be called at all!
     */
     virtual void setIHostApplication  (Steinberg::FUnknown*) {}
+
+    /** This function will be called to check whether the first input bus
+        should be designated as "kMain" or "kAux". Return true if the
+        first bus should be kMain, or false if the bus should be kAux.
+
+        All other input buses will always be designated kAux.
+    */
+    virtual bool getPluginHasMainInput() const  { return true; }
 };
 
 } // namespace juce