You can easily make a music block (chords or lyrics) shorter or longer. Just drag between blocks to change their duration.
You can zoom in or out to edit and play more accurately.
Feel free to play around, you can always undo or redo your actions to the lyrics & chords by clicking the buttons on the top of the editor.
Auto-scroll allows you to follow the lyrics & chords as it plays. Just click on the auto-scroll icon to turn it on or off. It’s located left to the zoom buttons.