That's the next thing I'm planning to do after I get transparency working.

Other things on my todo list:
- Allow multiple notes. With left/right arrow buttons for navigating to the previous/next note (right arrow button shall also be used for creating new notes, when the currently displayed note is already the last one). And a button for deleting the contents of the note currently being displayed.

- Two layers per note. One for text and one for drawing. Transparent background for both layers. In additon to the already existing text edit button, add A button for drawing. Depending on which of the two buttons you press, the corresponding layer will become the foreground layer and enabled for editing.