The free PitchProof add on 64 bit works great in MG2 standalone.
It tracks very well. Just one harmony but that’s all I want for guitar. Standard key select and mix controls.
Very similar to the Evetide Harmonizer I purchased many years ago for Sonar Producer but much easier and seems more precise but of course the eventide is much better now as in the following link and much much cheaper. If you want more than one harmony I think it’s a great deal now.
Of course if you use it in a DAW you can add more harmonies and in different keys.
The free PitchProof works for what I want on guitar but if you want multiple harmonies in a DAW: