Not sure if I'm the only one who suggested this, but could there be an option to swap between classic soundtracks and remasters?
Like:
Kanto: RGBY -> FRLG -> Let's Go: Pikachu
Hoenn: RSE -> ORAS
Unova: BW/BW2 -> Remasters?
I think this would be pretty neat, handy and good for people who prefer certain soundtracks to others.