@philsawa Unfortunately famistudio isn't very good for what we'd need, but we found something else, I can use sekaiju under WINE on mac and it works fine.
don't get me wrong, famistudio is amazing, it's a really good daw-like nes music editor with its own really really good homebrew driver, but what we were looking for was not something for nes games, and something that could handle more than 8 voices maximum(with vrc6)
Appreciate the suggestion though!!