Here are some moves for the chain I spoke of (only for Swordmaster style, though, but maybe I'll post it later)
O (repeatedly) (Hurricane) : Dante rotates the chain above his head with the great speed.The main move needed to perform advanced attacks, this will also add some defence to Dante.
R1+ LAS forward + O (The Storm) : Dante unleashes the elemental energy of the chain and lightning bolts (+ ice shards on lv 2 + fireballs on lv 3) hit the enemies.
R1 + LAS backward + O (Wind of Fate) (hold & realease) (only usable in DT) : The most powerful of the attacks, it will allow you to charge high amounts of energy and unleash it in one mortal blow.