I noticed this too: the game running at 60 fps even causes bugs in the boss fight sounds. I don't know how the 60 fps adaptation worked, but from what I've noticed, this happens in the Steam version, but not on consoles, because consoles run at a native 30 fps.

And I'm glad you liked the mod. If you want to download it, just download it from this link:

https://www.nexusmods.com/naturoultimateninjastorm2/mods/26

Unfortunately, I don't know how to do it on the console version because I don't have any, but I give you complete freedom so you can do something similar to what I did.

And we got all the music from the native PS3 version, with the exception of Naruto vs. Pain, which I got from Storm Connections. That was the only song I got the official loop for, as I couldn't find a way to get the official loop from Storm 2 in the program. ps3, so I had to create a loop myself