I know this must seem so obvious to many of you here but I can't seem to figure out what exactly this does for a ds lite? I know it add rumble functionality for games that enable this. I know that it supplies extra memory for games I assume utilize it. What else? Am I missing something? Does this allow you to play slot 2 games via a slot 1 flash cart? Does this eliminate the need to buy a slot 2 flash cart needed to GBA games on a ds lite? Help please.