
Using the “Song > Remove Used Files…” menu.
S1 will remove all audio which is NOT being used in the template if you choose the “Yes” button.
Important: Careful with the “Delete Files Permanently” checkbox. That also deletes them from your drive. Note that S1 still puts the files in the Trash/Recycling bin, but does remove them from the original disk location.
Best Practice: Open a fresh copy of your template, MODIFY IT as needed rather than clearing audio from an existing file, then saving the template.