Add some cutom logic to determine if this.active is needed.

source/funkin/graphics/FunkinSprite.hx

@@ -238,6 +238,18 @@ class FunkinSprite extends FlxSprite
     return true;
   }
 
+  /**
+   * @param id The animation ID to check.
+   * @return Whether the animation is dynamic (has multiple frames). `false` for static, one-frame animations.
+   */
+  public function isAnimationDynamic(id:String):Bool
+  {
+    if (this.animation == null) return false;
+    var animData = this.animation.getByName(id);
+    if (animData == null) return false;
+    return animData.numFrames > 1;
+  }
+
   /**
    * Acts similarly to `makeGraphic`, but with improved memory usage,
    * at the expense of not being able to paint onto the resulting sprite.

source/funkin/play/notes/StrumlineNote.hx

@@ -24,6 +24,12 @@ class StrumlineNote extends FlxSprite
     return this.direction;
   }
 
+  /**
+   * Set this flag to `true` to disable performance optimizations that cause
+   * the Strumline note sprite to ignore `velocity` and `acceleration`.
+   */
+  public var forceActive:Bool = false;
+
   public function new(noteStyle:NoteStyle, isPlayer:Bool, direction:NoteDirection)
   {
     super(0, 0);
@@ -103,19 +109,19 @@ class StrumlineNote extends FlxSprite
 
   public function playStatic():Void
   {
-    this.active = true;
+    this.active = (forceActive || isAnimationDynamic('static'));
     this.playAnimation('static', true);
   }
 
   public function playPress():Void
   {
-    this.active = true;
+    this.active = (forceActive || isAnimationDynamic('press'));
     this.playAnimation('press', true);
   }
 
   public function playConfirm():Void
   {
-    this.active = true;
+    this.active = (forceActive || isAnimationDynamic('confirm'));
     this.playAnimation('confirm', true);
   }