Help with Cheat please?

[Myxe]

Hi,

Matt has posted this cheat.

"hit xoxoxoxoxoxoxoxoxoxox in the middle of the game and you and your team mates will have infinite life"

At the risk of sounding thick - which button is o? i've just got the standard gamepad that comes with it - i am desperate to get past a level but the team keeps getting slaughtered

If anyone can help me i would appreciate it - thanks!

Pete