Vocal removing software/program?

Okay, a long time ago I tried this program that could make karaoke versions of songs for you. But it wasn't like most programs that do t he same thing, because you could specify if you wanted a female or male voice removed, so if more than one person sang, you could only take away the girls voice. I don't remember what it was called but I would like to download it again. Does anyone know the program I'm talking about and could you show me where to download it?