The Dual Shock2 controller will be able to sense 256 grades of pressure. In other words, the harder you press the button, the harder you will hit someone, or the faster your car will accelerate.
The Dual Shock2 analog controller can be switched to fully analog or digital modes, with the exception of the Start and Select buttons. Analog mode provides a pressure-sensitive function that, depending on the software, gives you precision control. The vibration function provides realistic feedback when supported by a software title.