Sorry I’ve only done the rpg pack , https://beatscribe.itch.io/gameboy-adventure-rpg-music-assets-mod , they take too long to make and many no longer use them.
I’d highly recommend your freind learn hUGEDriver , we have tutorials using two different systems , you’re game will sound better and he’ll have a better workflow , it’s really a good investment of time. There are also tools to convert fur to uge and midi to uge , you can even manually move mods to it.
Here’s tutorials if he’s interested
HUGEtracker (a bit more complex but full featured)
https://gbstudiocentral.com/tips/getting-started-in-hugetracker/
GBs tracker (built into gb studio , more simple)