diff --git a/.bin/music/test-60bpm.sj b/.bin/music/test-60bpm.sj
index ed55e79..57a5b3e 100644
--- a/.bin/music/test-60bpm.sj
+++ b/.bin/music/test-60bpm.sj
@@ -4,22 +4,22 @@ actor [0..1] {
   clip_left := 0.1;
 }
 background [0..1] {
-  inner_r = 0.8;
-  inner_g = 0.8;
-  inner_b = 0.8;
-  inner_a = 1;
+  inner_r := 0.8;
+  inner_g := 0.8;
+  inner_b := 0.8;
+  inner_a := 1;
 
-  outer_r = 0;
-  outer_g = 0;
-  outer_b = 0;
-  outer_a = 1;
+  outer_r := 0;
+  outer_g := 0;
+  outer_b := 0;
+  outer_a := 1;
 }
 posteffect [0..1] {
   clip_left  := 0.1;
   clip_right := 0.1;
 }
-variable [0..3.5] {
-  hoge = 1-time;
+variable [0..1] {
+  hoge = 1;
 }
 
 $repeat i 2 {
diff --git a/sjplayer/src/sjplayer/AbstractScheduledController.d b/sjplayer/src/sjplayer/AbstractScheduledController.d
index d3f4f66..66053ab 100644
--- a/sjplayer/src/sjplayer/AbstractScheduledController.d
+++ b/sjplayer/src/sjplayer/AbstractScheduledController.d
@@ -26,9 +26,22 @@ abstract class AbstractScheduledController : ScheduledControllerInterface {
   }
 
   override void Operate(float time) {
-    FinalizeCurrentOperationIfEnded(time);
-    PrepareNextOperationIfStarted(time);
-    ProcessCurrentOperationIfAvailable(time);
+    while (true) {
+      if (next_operation_index_ >= 1) {
+        const current = &operations_[next_operation_index_-1];
+        ProcessOperation(
+            current.period.ConvertToRelativeTime(time), *current);
+        if (current.period.end > time) return;
+        FinalizeOperation(*current);
+      }
+
+      if (next_operation_index_ >= operations_.length) return;
+
+      const next = &operations_[next_operation_index_];
+      if (next.period.start > time) return;
+      ++next_operation_index_;
+      PrepareOperation(*next);
+    }
   }
 
  protected:
@@ -87,33 +100,6 @@ abstract class AbstractScheduledController : ScheduledControllerInterface {
   }
 
  private:
-  void FinalizeCurrentOperationIfEnded(float time) {
-    if (next_operation_index_ < 1) return;
-
-    const current = &operations_[next_operation_index_-1];
-    if (current.period.end > time) return;
-
-    FinalizeOperation(*current);
-  }
-  void PrepareNextOperationIfStarted(float time) {
-    if (next_operation_index_ >= operations_.length) return;
-
-    const next = &operations_[next_operation_index_];
-    if (next.period.start > time) return;
-
-    ++next_operation_index_;
-    PrepareOperation(*next);
-  }
-  void ProcessCurrentOperationIfAvailable(float time) {
-    if (next_operation_index_ < 1) return;
-
-    const current = &operations_[next_operation_index_-1];
-    if (current.period.end <= time) return;
-
-    ProcessOperation(
-        current.period.ConvertToRelativeTime(time), *current);
-  }
-
   const VarStoreInterface varstore_;
 
   const ParametersBlock[] operations_;
diff --git a/sjplayer/src/sjplayer/Context.d b/sjplayer/src/sjplayer/Context.d
index 94b3e88..090e404 100644
--- a/sjplayer/src/sjplayer/Context.d
+++ b/sjplayer/src/sjplayer/Context.d
@@ -39,7 +39,12 @@ class Context {
            sjplayer.CircleElement,
            sjplayer.SquareElement,
            sjplayer.TriangleElement;
+    // FIXME: fucking solution
     auto factories = tuple(
+        tuple(
+          "variable",
+          VarStoreScheduledControllerFactory(varstore),
+        ),
         tuple(
           "actor",
           ActorControllerFactory(varstore, actor_),
@@ -65,10 +70,6 @@ class Context {
           "triangle",
           TriangleElementScheduledControllerFactory(programs, varstore),
         ),
-        tuple(
-          "variable",
-          VarStoreScheduledControllerFactory(varstore),
-        ),
       );
     foreach (ref factory; factories) {
       factory[1].
@@ -84,8 +85,8 @@ class Context {
     drawers_     = builder.drawers[];
     controllers_ = builder.controllers[];
 
-    actor_controller_      = factories[0][1].product;
-    posteffect_controller_ = factories[1][1].product;
+    actor_controller_      = factories[1][1].product;
+    posteffect_controller_ = factories[2][1].product;
   }
   ///
   ~this() {
diff --git a/sjplayer/src/sjplayer/VarStoreScheduledController.d b/sjplayer/src/sjplayer/VarStoreScheduledController.d
index fe0dcc5..07a9a5a 100644
--- a/sjplayer/src/sjplayer/VarStoreScheduledController.d
+++ b/sjplayer/src/sjplayer/VarStoreScheduledController.d
@@ -22,6 +22,7 @@ class VarStoreScheduledController : AbstractScheduledController {
     varstore_ = varstore;
   }
 
+ protected:
   override void SetParameter(
       ref in Parameter param,
       ref in AbstractScheduledController.VarStore vars) {