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An iPad, iPhone or Android tablet or phone, and a digital piano or MIDI keyboard connected by USB or Bluetooth. A tablet on the music stand is the nicest way to use it; phones work in landscape.

Most digital pianos made in the last decade have MIDI. If yours has a USB port marked “USB to Host”, or Bluetooth MIDI, you're set.

Lay the page flat in even light, fill the frame with the page, and hold still until the camera says it's sharp. The in-app camera guides you through it.

Yes. Open the piece and use the review screen to compare the score with your photo and correct clefs and key signatures. If a page went badly wrong, rescanning it in better light usually helps most.

Subscriptions are managed by Apple or Google. On iPhone or iPad: Settings → your name → Subscriptions. On Android: Google Play → Profile → Payments & subscriptions → Subscriptions. Deleting the app doesn't cancel it.

Sign in with the same account, then open Plan and tap Restore purchases.

In the app, go to Settings → Privacy & account. You can download your data or delete your account there — or see the delete-account page for how to do it without the app.

It doesn't have to. Keyboard timing calibration measures your connection's delay in a few seconds and takes it off your timing, so a slow link is never counted as playing late.