By someone else entirely!
http://zettaizero.wordpress.com/posts/You'll obviously need a copy of the ps1 ToP, legal or otherwise, and the patch supplied in the link above.
Wow, Cless productions got owned. I would try this but I don't have a PSX nor a ToP. xD
I have a copy of the game... but I don't feel like getting a disc ripper at the moment.
I'll try the patch sometime.