Warn about controlling 3D Stereo sounds.

korman/nodes/node_messages.py

@@ -862,6 +862,9 @@ class PlasmaSoundMsgNode(idprops.IDPropObjectMixin, PlasmaMessageWithCallbacksNo
         if self.looping != "CURRENT":
             msg.setCmd(getattr(plSoundMsg, self.looping))
         if self.action != "CURRENT":
+            sound = soundemit.sounds.get(self.sound_name, None)
+            if sound is not None and sound.is_3d_stereo:
+                exporter.report.warn(f"'{self.id_data.name}' Node '{self.name}': 3D Stereo sounds should not be started or stopped by messages - they may get out of sync.")
             msg.setCmd(getattr(plSoundMsg, self.action))
 
         # This used to potentially result in multiple messages. Not anymore!
@@ -886,7 +889,17 @@ class PlasmaSoundMsgNode(idprops.IDPropObjectMixin, PlasmaMessageWithCallbacksNo
             if self.go_to == "TIME":
                 layout.prop(self, "time")
 
-        layout.prop(self, "action")
+        if not random and self.emitter_object is not None:
+            soundemit = self.emitter_object.plasma_modifiers.soundemit
+            sound = soundemit.sounds.get(self.sound_name, None)
+            action_on_3d_stereo = sound is not None and sound.is_3d_stereo and self.action != "CURRENT"
+
+            layout.alert = action_on_3d_stereo
+            layout.prop(self, "action")
+            layout.alert = False
+        else:
+            layout.prop(self, "action")
+
         if self.volume == "CUSTOM":
             layout.prop(self, "volume_pct")
         if not random: