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I know what a vocal processor is. I don't have any idea what that has to do with the inability of the human throat to sing two notes at the same time.
Trying to think of what you COULD mean, I've only been able to come across two ways you could simulate the effect of solo harmonization live.
1) pre-record one vocal track. Bad idea because you could get out of time with yourself. Some people still do it though.
2) artificially raise or lower the pitch of the voice singing, and play the doctored and original vocals at the same time. Usually sounds really horrible. The only time I can think of that I've heard it working really well live was Jarvis Cocker of Pulp performing 'party hard' at Glastonbury 1998.
don't get me wrong, for more than one vocalist, good harmony is essential. However, for a quality solo artist, synthesized harmony sounds bloody awful.
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