Using a Parallax Propeller chip Luis created a way to add some realism to his RC truck. Hazard lights flash and even make the clicking relay sound when activated. The propeller plays the wav files that bring the truck to life. Nice effect when the truck starts moving, you can hear the motor start to pick up speed. There is a product called sound racer that lets you bring your real car to life by making it sound like it is much more powerful than it really is. You can see it in action below. I would like to test this system out with a car that has some massive subs.