This swaps out the Pixel Remaster soundtrack with the NES original.
This swaps out the Pixel Remaster soundtrack with the NES original. New tracks are given adequate or accurate NES original substitutes. All tracks are run through a conservative low-pass filter to make them a little easier on the ears.
First, in the root of your Final Fantasy PR install, replace UnityPlayer.dll with the included custom UnityPlayer.dll. This is required for basically any mod of this game.
Then replace with the included .bundle file in the properly shown directory and enjoy!