I have used V-vocal successfully for years, but recently I noticed a very obvious flange sounding distortion on parts of the vocal track, wherever I apply pitch correction, even for very slight changes in pitch.  This distortion is very obvious and cannot be corrected by formant changes.  Any ideas on what is wrong and how to correct it?    I am using X1 Producer.   Thanks.
 
Greg 

This can happen if the vocal is noisy, distorted, breathy, has effects on it, has a lot of headphone bleed in it, or is a stereo track. If you can't make the track clean and dry it may not be possible to use V-Vocal on it.

This was cross-posted in X1/X2 forum where I already used one of your previous replies on the subject http://forum.cakewalk.com/FindPost/2851104