Default [Q] Way to control separate app volumes? (game and music)

Hi i recently got the galaxy s5. ( i love the phone, but pissed about knox). anyway i am on public transit a lot and listen to my music and play games at the same time. well recently i got final fantasy 6 and there is no in game volume control(with seams like it would be a obvious thing to include). so when i turn it down, it turns down media which is both the music and the game. this completely kills the game for me as my music takes priority when i am on the bus. i got the this phone to also replace my falling apart ipod and phone. this seams like such a minor problem i can not solve. any program i can find requires a rooted phone ( with i dont have because of gay ass knox security)