More questions.
1. Do the non-leader abilities on the board have an effect on the scoring in a unit? Or, is it only the leader's abilities that counts?
For example, my leader is Chihaya, but I have Miki as the duo unit. So, if I have Miki learn duo abilities, will those effect the duo unit scoring? Or, does not work that way? (And, I need Chihaya to learn those duo abilities instead?)
2. What does leveling up a song do? In platinum stars, it increases your score for your chain combo. But, there's no chain combo in this game, so I was wondering what does leveling a song do?