I have an old movie sound track that I would like to edit to remove 60 cycle hum that occurs in the last 30 minutes of the movie. So, using PowerDirector 15, I select the portion of the track that needs editing and select edit audio. One of the choices is AudioDirector and I select it. The help file for AudioDirector says to "click on Hum Removal." Other than playing with the equalizer, I see nowhere to click on that. Is there a hidden "Hum Removal" button to click on somewhere or is the help file incorrect for this version?