Chris is correct; however it *does* add a couple of functions over the Fc4a: with the fc3 you can do analog pitch bends, and inconvenient volume control, for example. But he's correct; none of them use half damper on the piano. In practice you would never use an FC3 for volume control because you'd have to be an android to accurately control the 0-127 value with your foot pressure; the pitch bend on the pedal I use all the time (in my Bohemian Rhapsody video, for example).
Mark