Click on the punctums to hear the note.
Left and right arrows move the staff
Up and down arrows change the pitch of "Do" or "C"
Clicking the C-clef on the left toggles between C-clef and F-clef (or you might call them Do and Fa clefs)
To turn what you see into what you can hear.
Now with moveable clef - or moveable staff to be pedantic.
Next to add a flat somehow...