Yes. Light Attack, Medium Attack, Heavy Attack, and Special Attack. L, M, and H are your normal attacks from weakest/fastest to strongest/slowest. The S button is your launcher. It juggles (puts your opponent into the air) and auto-pursuits (brings you up with your opponent), so that you can do air combos. Special moves are made by pressing one of the strength buttons in tandem with a joystick motion. On a 360 controller...? X should be L, Y should be M, B should be H, and A should be S. Shoulder buttons should be to call in assists. I say "should be," because that's how it was when I played it at EVO 2010.
Sorry if all this sounds like I'm talking down to you. Just clearing things up, if you don't know.