The design started with three main interactions.
The tree interactions are allocated to the bottom, lower center and the top for the quickest accessibility. With the Play/Pause button, when you pause the sound, the graphic would fade out toward the center. In the mixer area, you can swipe left to access more built-in tracks hidden on the right side. On the top, you can slide between compositions, rename/duplicate/delete them and slide to the far right to create a new composition.
Apart from the three main interactions, two additional buttons were added to the sides of the Play/Pause button. The list button on the left allows you to View All Compositions in a list view and the plus button on the right allow you to Add a New Composition.