Undo thoughts, and an issue with audio track swapping

Hello,
Sorry to hear that the current undo behaviour is crucial to your experience with Cubasis. As with any other app, you can request a refund anytime on iTunes (AppStore). You can find many tutorials on Google on how to do that. Please note that after requesting a refund, iTunes will delete Cubasis from your device and you won’t be able to use Cubasis anymore (unless you purchase the app in the future again).