I've never heard of any consumer software that could do what you ask. Apart from that I don't think they use software.
Take a song from Disturbed for example, whether you've heard of them or not I don't know. Anyways Their song "Down with the Sickness" has 2 versions, a clean and an unclean version, personally I prefer not to censor my music and just get the unclean version, but my point is they probably re-record the song instead of using software in the studio.
I can't confirm it but as I've said, I have yet to see consumer software, or for that matter, ANY software accomplish the feat you want. Although Perhaps a wave editor (not sure if that is the proper term but no doubt someone will correct me if I am wrong) could help, I have zero experience with them but you basically have to edit the song yourself. I know some good Macintosh Apps because my Friend has one, but I don't know any good ones for the PC.
that's right. i wanna know how to do Word Masking. i need to know what utilities (free or not) are out there which will enable me to do That.
and i know They exist, because, all of us regularly hear songs in which certain words, or whole Terms, get silenced, while The Music plays on.
so if They get to do It then so should I -- for Personal Enjoyment.
any-and-all help would really be appreciated.