This site is for users of Korg's "A" series of effects processors which includes the A1, A2 and A3. Korg made several other processors and pedals that appear to be in the "A" series, but they are completely different (and totally inferior) to the true "A" series processors.
Take a look around. A favorite first stop is the FAQ. It's jammed full of great info.
I hope you like it!
As Sterling says, "Fill the world with sound!" -Aaron