Please use Turbowarp for a smoother experience https://turbowarp.org/1167925132?fps=60&hqpen&offscreen&limitless Use the greenflag to replay Drag on an empty space to move the stage around Press S while dragging to select multiple notes Double Tap to create a note Drag the middle part notes to move them Drag the ends of the notes to create slide notes Press and hold a note until a context menu appears for you to delete them
Used @CasTur 's Cohen-Sutherland Script for dealing with off screen notes If you don't use Turbowarp be aware that there is a note pitch limit