To enable rapid fire, tap the "Mod" button located on the bottom of the controller. You will see the player 4 LED start flashing indicating Rapid Fire is now activated. To turn off Rapid Fire tap the "Mod" button again and the Player 4 LED will stop flashing indicating rapid fire is turned off.
There are 10 modes to select from. Each is pre-programmed with a specific speed but can be independently programmed to a new speed. To Change to the next mode you must hold the "Mod" button on the back of the controller for 3 seconds. You will see the player 4 LED flash, count the number of flashes of player 4 LED. This will indicate which mode you are currently in. (2 flasher=Mode 2) (3 Flashes=Mode 3). You can also scroll back to the previous mode by holding "R1" along with the mod button.
Mode 4: 8.33sps COD-World at War Only - Riffles
Mode 3: 16.67sps GTA4, Left 4 Dead, RDR, COD Series; Auto
Mode 2: 11.35sps Call of Duty Series: Pistols
Mode 1: 8.33sps Call of Duty Series: Riffles
more and more 10 mode Settings