SightReadingFactory.com allows you to optionally annotate your music. To do this:

  1. Generate some music that you'd like to annotate.
  2. Click the gear icon on the top right of the toolbar 
  3.  Check the 'Use Annotations' box
  4. Use the 'Annotations' dropdown to select the annotation you'd like to use.
  5. Generate some new music for the annotation to appear.
  6. You can use the 'a' hotkey to toggle the annotations on and off.