I'm having the same problem. None of the tracks that I have tried has taken anything off. When I click the button - I'm not even sure anything happens. There needs to be some sort of pop-up letting you know that the program atleast attempted to take off the vocals.
It would be great if someone could tell me if there is suppose to be a pop-up because all the other "Special Effects" have things pop up. I just want to make sure this feature is even working.
Thanks
Edit: Is there a test file that I could find some where that would allow me to see this feature working?
because I can't seem to find any file that will allow this feature to work.