carkins,

The real tracks analogy is entirely different than recording 'real track vocals' where words would be involved. Its the dynamic changes to the 'voice print' you refer to in your first post, due to different words, that makes this nearly impossible without it sounding mechanical and artificial.

Alan Jackson, you should be able to at least ape his twang. Just try it. Practice it.

I'm from Michigan, with perhaps a strong midwestern accent, but nobody ever accused me that I was from the south. However, I'm not afraid to pretend that with my voice when the song calls for it. No it's not Alan Jackson, but it sounds much more like him than some computer algorithm would.

Here's a song I wrote and recorded this past February as part of the February Album Writing Month called 'Non-Hippie from Boulder'.

http://fawm.org/songs/11075/

Hurry recorded guitar and vox 1 at the same time, added doubled vox for a chorus, then added bass.

Contrast that with something that's more my natural voice, again recorded this past February Album Writing Month, similar instrumentation with little care of post production and processing.

http://fawm.org/songs/12021/

I have a nasally thing going on no matter what. That's my voice.

-Scott