V-Vocal Strange Phasing Sound

That "phasing" effect is exactly that: comb filtering causing phase cancellations. Long story short: your vocal track isn't clean enough and it's confusing V-Vocal.

There are lots of factors that could be relevant. Your performance might be overly breathy. There may be distortion at the preamp. You may have excessive headphone bleed. Your mic gain might be too high. Sometimes, phase issues occur simply due to singing too close to a reflective surface like a window, and V-V will exaggerate any phase problems already in the track.

Here's how to avoid that hollow, metallic "phasey" effect:

- sing as far back from the mic as is practical
- keep the mic gain as low as is practical
- keep the headphone volume as low as is practical (you can train yourself to monitor at lower volumes)
- use headphones with good isolation (most cheap cans are terribly leaky; the Sennheiser HD280Pro is a standard because it's cheap and has good isolation)
- do not sing with one can unless you turn the volume down in the unused side or have a one-sided headphone meant for that technique
- for some singers, a dynamic mic may yield better results than an LDC
- use acoustical absorption in the singing area (put some 703 around the mic if you can't have an actual vocal booth)
- always record vocals in mono
- never record effects such as reverb, echo or chorus (add them afterward, and only after pitch correction)
- and the #1 tip: never let V-V or any other pitch-correction software do the correction automatically. Correct every phrase by hand, one at a time, and don't bother correcting any portion that's breathy or non-pitched (e.g. shouts, grunts, moans and such). And don't correct ANYTHING that doesn't really need it! Ignore the visual display -- LISTEN to the phrase; does it SOUND off-pitch? Just because the little line isn't precisely on the note does NOT mean the word or phrase needs correction!