I have Silent/Gaming mode set to be ON all the time. It's great if you are using an application or game in Full Screen mode. It helps with other games more, in my case, because I mostly use FSX in Windowed Mode. That way I can go to other applications without having the FSX window failing to reappear without having to use the CTRL+ENTER shortcut for Full Screen/Windowed Mode (I always have to go to Windowed Mode before returning to Full Screen Mode).

Mark