So i've recently started to edit the original of my guitar hero 2, i have all the songs i want in it, but i want to change the Fret colours on the screen

example: Red replaces green, orange replaces red, like a rainbow basically.

I have gotten the buttons that color but the notes coming at me havn't changed. anybody here know a way they can help?

btw: im not giving out any information about the custom itself.