added 4 cyl

Program.cs

@@ -33,7 +33,7 @@ public class Program
     // Audio & simulation
     private static SimulationRingBuffer _simRingBuffer = null!;
     private static SoundEngine _soundEngine = null!;
-    private static TestScenario _scenario = null!;   // cast to access ThrottleArea
+    private static Scenario _scenario = null!;   // cast to access ThrottleArea
     private static Font? _overlayFont;
     private static Text? _overlayText;
 
@@ -50,7 +50,8 @@ public class Program
     {
         var window = CreateWindow();
         LoadFont();
-        _scenario = (TestScenario)InitializeScenario();
+        _scenario = new TestScenario();
+        _scenario.Initialize(SampleRate);
         _lastThrottleUpdateTime = 0.0;
 
         _simRingBuffer = new SimulationRingBuffer(131072);
@@ -170,13 +171,6 @@ public class Program
             };
     }
 
-    private static Scenario InitializeScenario()
-    {
-        var sc = new TestScenario();
-        sc.Initialize(SampleRate);
-        return sc;
-    }
-
     private static void OnMouseWheel(object? sender, MouseWheelScrollEventArgs e)
     {
         if (_timeWarpActive) return;