ROM Hack How do you get Custom Music in SuMo?

[Imacaredformy2ds]

I want to replace a few tracks with say, remixes
I've a N3DS, Luma (don't know ver) a9lh, time, and patience
If there's already an answer to this in another thread them simply linking me to it would be great
Keep in mind I'm kind of a noob still
If this thread is pointless, then mods pls delet

 

[KunoichiZ]

https://gbatemp.net/threads/someone-know-how-to-use-saltysd-with-pokemon-su-mo.451401/

Look through the last 4 or so pages for instructions.