System 246: What desides language?

I'm playing Soul Calibur on the arcade, but I'd love to know how to change my US copy to a JPN one. Is it just the DVD that I need, or is it the security cart, too? I would really like to play with the JPN voices if possible. Anybody have an idea?

i think it's the memorycard

I'd like to know this too, as stupid as it sounds I'd like to pick up Capcom Fighting Evolution just to complete the collection, but if it's Japanese only then I wont even bother.