A luma layeredfs patch that replaces musics from Etrian Odyssey Nexus with their FM versions.
To install, download the correct version for your region here, and simply extract the contents of the zip archive to the root of your SD Card. Make sure that "Enable game patching" is checked in Luma3DS Settings.
Most tracks in the mod are from the Original Soundtrack CDs instead of from the previous 3DS games. I chose to do it that way because the 3DS remakes actually use the PC-88 versions of the musics instead of the original Nintendo DS ones. It also provides a better sound quality overall, and especially with headphones.
All the tracks in the mod have been manually looped by myself, and while I can guarantee that the mod doesn't crash the game, I didn't fully listen to all of the musics so some loops may be off. Please contact me on Discord (Jeido#1478) if you find anything that doesn't work as intended.
Here are the replaced musics:
All of Etrian Odyssey.
All of Etrian Odyssey 2.
All of Etrian Odyssey 3.
All of Etrian Odyssey 5.
Most of Etrian Odyssey Nexus (from Yuzo Koshiro's Youtube channel).
Etrian Odyssey 4 and the rest of Etrian Odyssey Nexus are left as is, since there are no FM version of them existing at all.