Make main variant group audio IO in stereo groups, fixes VST3 side

dpf

@@ -1 +1 @@
-Subproject commit 615a841552f738503882fbf5fb84d7de08299f26
+Subproject commit 850308cfa4326a7871b1ba955a3ce7cd44a1d657

src/CardinalPlugin.cpp

@@ -733,20 +733,49 @@ protected:
 
     void initAudioPort(const bool input, uint32_t index, AudioPort& port) override
     {
-       #if CARDINAL_VARIANT_FX || CARDINAL_VARIANT_NATIVE || CARDINAL_VARIANT_SYNTH
-        if (index < 2)
-            port.groupId = kPortGroupStereo;
-       #endif
-
-        if (index >= 8)
+       #if CARDINAL_VARIANT_MAIN
+        if (index < 8)
+        {
+            port.groupId = index / 2;
+        }
+        else
         {
             port.hints = kAudioPortIsCV | kCVPortHasPositiveUnipolarRange | kCVPortHasScaledRange;
             index -= 8;
         }
+       #elif CARDINAL_VARIANT_FX || CARDINAL_VARIANT_NATIVE || CARDINAL_VARIANT_SYNTH
+        if (index < 2)
+            port.groupId = kPortGroupStereo;
+       #endif
 
         CardinalBasePlugin::initAudioPort(input, index, port);
     }
 
+   #if CARDINAL_VARIANT_MAIN
+    void initPortGroup(const uint32_t index, PortGroup& portGroup) override
+    {
+        switch (index)
+        {
+        case 0:
+            portGroup.name = "Audio 1+2";
+            portGroup.symbol = "audio_1_and_2";
+            break;
+        case 1:
+            portGroup.name = "Audio 3+4";
+            portGroup.symbol = "audio_3_and_4";
+            break;
+        case 2:
+            portGroup.name = "Audio 5+6";
+            portGroup.symbol = "audio_5_and_6";
+            break;
+        case 3:
+            portGroup.name = "Audio 7+8";
+            portGroup.symbol = "audio_7_and_8";
+            break;
+        }
+    }
+   #endif
+
     void initParameter(const uint32_t index, Parameter& parameter) override
     {
         if (index < kModuleParameters)