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Full Version: In app purchase. Playback stopped
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Hello, i have The problem described in attached screenshot on the link below 


 What i have To purchase and how To? 

Tanks in advance
From the 'Available devices' screen at start-up, you can see a shopping cart under the USB MIDI part. You can purchase from there. The app will also ask you for an in-app purchase (if you haven't done so) when saving a project with MIDI.