Question

Unmeatured tremolos(///) or Fingered tremolos(???) do not play when I entered them. How can I make them sound?

Answer 1

You will want to make sure that you are using a stringed instrument such as the violin, viola, cello, or double bass.  If you continue to have an issue you might want to try reloading your sounds.  Just go to File (Notion on a Mac)>Preferences>Audio and press the "choose..." button.  Navigate to your Sounds folder and select it.  This should reload your sounds.