In the description of swift attack, it says that you can use a full action to make 2 melee attacks. Then if you are using 2 melee weapon and have the 2 weapon wielder talent, you can make the swift with 1 weapon and a single attack with your other melee weapon. If you are using a melee and pistol and have the 2 weapon wielder talent, you can make the swift attack with mlee and make a single shot with the pistol.
My question is which 2 weapon wielder talent do you need to use the melee/pistol set up? 2 weapon wielder(melee), 2 weapon wielder (ballistic) or both?