For most automatic pitch correction (the kind you would use in real time) you have to set the key, the scale type and the amount of correction. It won't correct you from a Ab to a C but it might correct a half step. The problem is if your off more than that it may correct you to a G instead of a C. It corrects it to the nearest note in scale, which may not be the right one.
I just got my hands on a digitech live 4 www.digitech.com/products/Vocalist_Live4/ and it has pitch correction.
download the manual and read about pitch correction.




[This message has been edited by mikeathome1 (edited 05-30-2008).]