[Feature Request] Practicing without clefs.

[fjgenieter]

I would love it if you could add two options:

• When practicing one clef, an option to make the clef invisible. This way you must learn where the clef normally is and cannot calculate as fast.
• When practicing two or more clefs, and option te see the clef in the corner and not on the lines. Same reason as above.

I would find this really useful, because you are mostly reading on paper very far away from the clef. This would be a way to practice that.
Thank you for the app!!