Custom Songs

I absolutely love this hack. The one glaring problem for me that's CRUSHING my immersion is some of the song choices. Like in the beginning when it plays the final countdown. Thankfully there's a patch where I can change that song. Is there a way for me to patch custom songs to my game? For example the fanfare music I only have 2 choices and one of them is CT fanfare which also kinda breaks my immersion. I'd really like if there was an option to add the classic FF fanfare. Also the classic FF chocobo music ect.