Learning to play the darbouka

Hi, everyone!
This is a darbouka's teaching app.
In first tab "Visual" the places to beat with notes appears on the darbouka after pressing on “Play” button. As darbouka player can make different notes by beating on one and the same place we need to have to display notes too.
On the second tab "Scroll" data is shown as a table with running points. When the point reaches vertical line - user makes beat that note, on which line was pointed. In this system exists 2 type of notes (C and F) which jum previous note. They connected with previous, so I show them beside point, which they will jum.

Full presentation https://www.behance.net/gallery/53747109/Learning-to-play-on-the-darbuka