My review for now is 1/10.
I don't think there's a way to use headphones with this game since the gamepad doesn't let you listen to the game audio. There's also no way to play to play off tv.
Considereing it's a game about music, this is a pretty baffling design choice ( expect if I am wrong and there is a way but I didn't find it yet).
Since I don't have a Tv with sound, this game became kinda unplayable for me.
Sounds like your shitty setup is a 1/10. Not the game =P