Fix a bug where removing audio tracks wouldn't remove their visualizers.

source/funkin/audio/visualize/PolygonVisGroup.hx

@@ -8,8 +8,7 @@ class PolygonVisGroup extends FlxTypedGroup<PolygonSpectogram>
 {
   public var playerVis:PolygonSpectogram;
   public var opponentVis:PolygonSpectogram;
-
-  var instVis:PolygonSpectogram;
+  public var instVis:PolygonSpectogram;
 
   public function new()
   {
@@ -51,6 +50,43 @@ class PolygonVisGroup extends FlxTypedGroup<PolygonSpectogram>
     instVis = vis;
   }
 
+  public function clearPlayerVis():Void
+  {
+    if (playerVis != null)
+    {
+      remove(playerVis);
+      playerVis.destroy();
+      playerVis = null;
+    }
+  }
+
+  public function clearOpponentVis():Void
+  {
+    if (opponentVis != null)
+    {
+      remove(opponentVis);
+      opponentVis.destroy();
+      opponentVis = null;
+    }
+  }
+
+  public function clearInstVis():Void
+  {
+    if (instVis != null)
+    {
+      remove(instVis);
+      instVis.destroy();
+      instVis = null;
+    }
+  }
+
+  public function clearAllVis():Void
+  {
+    clearPlayerVis();
+    clearOpponentVis();
+    clearInstVis();
+  }
+
   /**
    * Overrides the add function to add a visualizer to the group.
    * @param vis The visualizer to add.

source/funkin/ui/debug/charting/handlers/ChartEditorAudioHandler.hx

@@ -223,6 +223,10 @@ class ChartEditorAudioHandler
     {
       state.audioVocalTrackGroup.clear();
     }
+    if (state.audioVisGroup != null)
+    {
+      state.audioVisGroup.clearAllVis();
+    }
   }
 
   /**