After this, open the folder that contains the extracted RomFS and place the song in the sound/bgm folder. Build the RomFS using what ever tool you may be using, then open it with your hex editor. From here, delete the first 0x1000 bytes (0x0-0xFFF). Yes, this means REMOVING them from the file altogether, not 00'ing them. Some hex editors warn you if you attempt this, just ignore it.

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