Call it the PitchFinder if you will.
It doesn't need bells and whistles. For live sound, one only ever uses the chromatic scale so additional scales and tunings will be unnecesary. And a maximum bend of a couple of semitones will be adequate for all but the most extreme Karaoke sessions.

The only requirement will be that it needs to be fast. Near real-time. This will allow me to avoid the large host latency when patching an AutoTune plugin across the ASIO drivers. Not to mention not having to lug around the external hardware equivalents.
If you do this, you'll be my hero.