The developers are confident you'll love the software, but they offer refunds for keys purchased on their website with no questions asked. For PayPal purchases, you can get a refund for up to after purchase. For other payment methods, they offer refunds for up to 120 days . For in-app purchases made through the iPad or Android versions, you must request refunds through Apple or Google, respectively.
The app has been optimized to handle complex MIDI files more efficiently. Synthesia 10.9 Unlock Key