How to mod/add/replace music to a 3ds game?

I want to change the ingame music of a 3ds title with music from a soundtrack like the windows mp3 files and etc.

Ex.I’m using a encrypted copy of Yo-Kai Watch Busters and decrypted it with hackingtoolkit9ds to access the sound and used brawlbox to test the audio(since 3ds sound files are .bcstm files) and want to replace the sounds with Persona 3/FES/Portable/Reincarnation music(update: I also plan on using Persona 4/Golden/Arena/Anime music as well).

Do I need some sort of converter for this or do I need a more precise instruction to replace the ingame sounds.

check out these links:

or just ask for help (recommended) on this board:

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