Thank-you both for your input. I am not a singer but would like to be, so the new harmoniser which has a type of auto tune, might come in handy. I was already thinking how I could change out the "do whops" in the styles to change their flavor, but I tried that on some Tyros 2 styles and some replacement voices needed an octive change and I found that there is no facility to do that to the styles voices and I guess that has not changed on the Tyros 4. I guess you have to find a voice that suits that tuning or switch the voice off.
Cheers
Carol