'Power Up' move?

On a few videos, I've seen Yoshimitsu 'power up' so that his fists glow red... what's the command for this?

Cheers for any feedback!

Press Circle,Square,Triangle,and X at once.
Press those at the same time and they'll glow.

Aaaah.... I think I tried that before but nothing happened. Guess I just didn't press them right. Thanks!