SoundInstance changes, small updates in Sound and Texture2d loaders.

TestGame/TestGame.cs

@@ -47,6 +47,8 @@ public class TestGame : Game
         _uiLayer = new UiLayer();
         _worldLayer = new EntityLayer();
 
+        _testSoundInstance = _audioBackend!.CreateInstance(_testSound!);
+
         Input.AddInputMapping("play", new InputAction[] { new KeyInputAction(KeyboardKey.Spacebar) });
         Input.AddInputMapping("sprint", new InputAction[] { new KeyInputAction(KeyboardKey.LeftShift) });
         Input.AddInputMapping("toggle_fullscreen", new InputAction[] { new KeyInputAction(KeyboardKey.F11) });
@@ -64,6 +66,13 @@ public class TestGame : Game
     {
         while (_scene!.ShouldRun)
         {
+            if (Input.IsActionPressed("play"))
+            {
+                _testSoundInstance!.PitchVariation(0.9f, 1.1f)
+                    .VolumeVariation(0.98f, 1.02f);
+
+                _testSoundInstance!.Play();
+            }
             _scene.Update();
             _scene.BeginDraw();
             _scene.EndDraw();
@@ -77,6 +86,7 @@ public class TestGame : Game
     }
 
     private Sound? _testSound;
+    private SoundInstance? _testSoundInstance;
     private Font? _font;
     private FmodAudioBackend? _audioBackend;
     private Scene? _scene;