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They gave me a free pack to redeem within 4 hours... at 2 am. Thanks, seriously.
Think it just means 10.
But on the app store page it says "Offers In-App Purchases" so it's really not that weird to assume that there are IAP.
Symphonica's broken? Just tried it on ios 9.3 iphone 6 and it works just fine. Are you on a later/earlier version of ios9?