Gaining 3 stars with Xero Sum

[Post New]by centrifuga on Feb 9, 14 7:57 AM
Ok, I must be dumb, but how on earth do you reach the 3 stars rating needed to unlock the next band, while you're playing with Xero Sum? I finished the story long long way to get the 3 stars... do I have to buy better instruments? Do I have to keep on playing like mad even if the story is over? How did you manage to reach 3 stars in time with the storyline?
Thank you!

 
 
 
 
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