diff --git a/functions/change_slowly.h b/functions/change_slowly.h
index 04095252a..0a2d50820 100644
--- a/functions/change_slowly.h
+++ b/functions/change_slowly.h
@@ -9,7 +9,7 @@
 class BladeBase;
 
 template<class F, class SPEED>
-class ChangeSlowly {
+class ChangeSlowlySVF {
 public:
   void run(BladeBase* blade) {
     f_.run(blade);
@@ -31,6 +31,7 @@ class ChangeSlowly {
     }
   }
   int getInteger(int led) { return value_; }
+  int calculate(BladeBase* blade) { return value_; }
 private:
   PONUA SVFWrapper<F> f_;
   PONUA SVFWrapper<SPEED> speed_;
@@ -38,4 +39,11 @@ class ChangeSlowly {
   int value_;
 };
 
+// optimized specialization
+template<class F, class SPEED>
+class SingleValueAdapter<ChangeSlowlySVF<F, SPEED>> : public ChangeSlowlySVF<F, SPEED> {};
+
+template<class F, class SPEED>
+using ChangeSlowly = SingleValueAdapter<ChangeSlowlySVF<F, SPEED>>;
+
 #endif