Song recording methods make this impossible
You're right that it's unlikely there's any third party software capable of this. The closest thing you can do with wave software is to turn off all sound for the half-second you wish to censor.
When studios record CDs, they record each track seperately INTO software - usually several versions of each track, in fact. To produce the CD, they use the software to blend the different tracks together. In the case of a censored song, they will simply silence the singer's track for that half-second. Once it's on the CD however, there's only one 'track' - they've been mixed (disregard stereo and 5.1 sound for this discussion). Trying to take out one track (singer) at that point is like trying to take out some of the baking soda you've mixed into dough - it's pretty tough.
Getting down into the wav file itself COULD do it, but you'd have to do so much adjusting, it'd be almost impossible, and would never sound perfect. As far as I know, there's no way to automate (program)this.
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