for CO
4 all you have too do to make a rapid fire controller is solder a wire to the negative terminal on the first player LED light and then the other end too the middle solder point under the A button on the mother board. (with a momentary push button switch in the way of course) What happens is that the LED lights are powered by pulses of electricity that go to it to save battery. The other solder point is were the right trigger is activated. So, electricity is sent to the right trigger making the controller think you are pushing the trigger really fast.