diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
index 6ae636c..e20582c 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
@@ -124,6 +124,7 @@ namespace QuickLook.Plugin.VideoViewer
 
         public void Dispose()
         {
+            // old plugin use an int-typed "Volume" config key ranged from 0 to 100. Let's use a new one here.
             SettingHelper.Set("VolumeDouble", mediaElement.Volume);
 
             try
@@ -270,7 +271,8 @@ namespace QuickLook.Plugin.VideoViewer
                 mediaElement.LayoutTransform = new RotateTransform(rotation, 0.5, 0.5);
 
             mediaElement.Source = new Uri(path);
-            mediaElement.Volume = SettingHelper.Get("VolumeDouble", 0.7);
+            // old plugin use an int-typed "Volume" config key ranged from 0 to 100. Let's use a new one here.
+            mediaElement.Volume = SettingHelper.Get("VolumeDouble", 1d);
 
             mediaElement.Play();
         }
@@ -281,4 +283,4 @@ namespace QuickLook.Plugin.VideoViewer
             PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
         }
     }
-}
\ No newline at end of file
+}