Draft said:Each style dictates what the O or A button does.
Swordmaster: extra melee attack
Gunslinger: extra shooting attack
Trickster: dodge
Royal Guard: block
And then later on you get a fifth form, but don't worry about that yet.
The simplest form, or at least the one that's probably easiest to understand, is Swordmaster. Just work the extra attacks into your normal combos.
I see, though you probably meant the B button. I realized part of that when I was experimenting with the modes. What difference does it make leveling each of them?