in my opinion, only ex5 matters. ex5 helps when you're about to enter a scene or movie. ex5 prevents the game from freezing during those moments. yes, I know that synchronization problems occur when ex5 is checked, but if it will cost you the safety from rom crashing/freezing, what do you have to lose? I dont know about ex0, but tick it anyways. i use ex0, ex3, and ex5 now. i've read sumwhere that ex3 helps with the sound....