Really? I know a few bad singers where a harmonizer and pitch corrector made them sound ...well... half decent anyway.
Sometimes being a "perfect" singer isn't required...take Neil Young for example.
When someone told him he was singing off key, he replied "That's
my sound, man!"
I have great time with the Tyros4's new
VH-2 Harmonizer (it's awesome)...using it as a
vocoder for those cool
robotic voices is a real hoot, and only
one of the many neat things you can do with it.
I'm sure the Korg's harmonizer allows you to do the same things.
Ian