Octorok

Hello! so basically I want to play the Fate / stay night PS2 version with voices, but with japanese text and not english. is this possible to do this by deleting some files in the Fate / stay night folder or something? if you know I would be happy if you could help me out. or if you maybe know someplace where I can get a voice-patch for my normal unvoiced japanese version of the game. cheers