Eddie..... it's much faster then trying to record multiple harmony tracks and get the phrasing and notes exactly right. I heard that Paul McCartney spent several days getting his vocal harmonies and doubling parts perfect. This gets you there instantly when you clone.

Regarding using this stand-alone or as a plug in...... I think if you open it as a plug in the track of a good DAW, you should not have any issues. I have always run this in Sonar without any issues.

Keep in mind that it is a HUGE resource hog so don't try running a dozen instances of this at the same time, and you should be OK. I will run one or two instances..... I use it on the main track and then render it, aka, print the plug...... then open 2 instances in 2 tracks for harmonies..... this seems to run quite stable.

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www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.