I can't help you but could suggest a better product from what I'm told. I use Melodyn. Its excellent and very transparent when you want it to be.

I have to agree with Chris audiokid...Melodyne is excellent.

I have both Melodyne and Izotope Nectar 2 which has their Pitch Editor which also is very good.

I haven't used the Auto-Tune EFX 3 so I can't comment on how it performs against the two I mention above.

Personally, I try not to use a pitch correction unless its absolutely necessary and under extreme circumstances. I recently had a song I was mixing where the vocals were tracked by someone else, the recording was well done but the vocal was a little pitchy...I ran it through Nectar 2 Pitch Editor, while it did correct the issue and was hard to detect the correction, I decided to run with the original uncorrected track as it kept the human element and feel to the track, with an originality to the performance.

Nothing like ending up with something that has a robotic, Battlestar Galactica Cylon inspired, Cher auto-tune effect for a vocal, which I absolutely, personally can't stand.

But, if used subtly and used right, pitch correcting vocals can be an advantage to fixing something that sounds up to shit.

You can't polish a turd...but you can roll it in glitter.;)

DKAUDIO, post: 437782, member: 49673 wrote: It sounds as though when the note isn't quite reached by the singer, the plug in is trying to force the note where it isn't normally going it in turn amplifies this harsh frequency and makes a painful ringing

Does it allow you to open an editor to be able to move notes around ?

If so can you go in and change the note manually on the grid, maybe to make it less harsh or are you relying on the plug-in preset to do the correcting?

I know exactly what noise your talking about, and I thought I was the only one who ever heard it. I believe it's intonation based, and the plugin can't quite keep up, with the complex harmonics the throat generates. It's either the algorithm coding, or just a bunch of cancelled frequencies, I think.

You may want to try melodyne, or manual correction mode if your version has it, if not it might be worth upgrading to the version that does,

If it's only bothersome on that one line, I'd isolate that line on a duplicate track, and treat it separately with watever it took. That way you can leave auto tune artifact free on the original track, and band aid the botched line.

One method to fix that is to detune about 20cents up or down with a plugin prior to the Autotune EFX.
Another is subtractive eq with highpass filter before EFX to remove subfreq.
Works sometime.
If it doesn't, I reach for Melodyne, correct vocal a little..then use EFX for the effect.