Many vocal processors I see on the market feature and advertise the pitch correction. As I understand, they use the sound input from the instrument (analog or MIDI) to decide how the note should actually sound and "pull" the voice up or down to match the expected pitch. Or allow to configure the key in menu.
How often this machinery is used by the usual performers (not the absolute beginners)? Should I switch it off first thing to do if I think I am capable of singing in a right pitch for the particular song? I plan to buy a vocal processor for other effects like echo, etch.