Hello! My name is Adam, I'm a Unity developer and terrible guitarist from WV, USA where in the last 3 years I have either worked on or directly overseen just about every genre, from multiplayer FPS games using PUN, to casual puzzle games and AR business apps.
This project really stood out to me, because I recently started trying to learn guitar once more,, and am trying to learn music theory this time. I was looking for something similar to this the other day, and couldn't really find anything that I thought would really help me. I think this would help a lot of people like me who don't really have the time/desire to dutifully study, but have bits of time to spend playing "games" like this, sortof how Duolingo is.
That said I've spent the last several hours reading more to try and better understand your game, and I've read your a significant number of times but I still don't fully understand how the "Second Problem in "Problems to Solve" works due to my lack of understanding of music theory, but I do see how it could be algorithmically solved, so as long as you have that part finished in the app and I can certainly port that over to unity.
The first problem I believe can be solved by a nice and intuitive touch control, where you pinch to zoom/expand, and use either 2 fingers to pan the camera around, or a delayed tap and hold, then pan camera.
Please let me know if you have any questions as I really would like to work with you on this,
Adam