Version 1.3 of the editor adds a File menu: open a chart from a .txt file and save it back to your device with Ctrl+O and Ctrl+S.
New as well: the Player. Add @spotify: with a track link to your chart, and @loop: Solo 2:41-3:05 for the parts you want to practise. The player repeats a loop until you move on.
Text boxes can now hold several labels on one line, each in its own colour: @box: [A] [B]!r [C].