I don't remember what mode I use, but keep messing with it, it will work. Its a bit tricky to set up the first time, but once you get it set up right, if you don't mess with it, it works everytime. Find the right mode on the dolphin bar, you might have to enable some settings on mame. Tons of videos on youtube. I have 2 dolphin bars so I can play 2 player light gun games. Works well enough. Cheapest solution and pretty good results for the price.