ROG,
I would have to say this is my whole MO in a nutshell, what you have described.
If I am doing a guitar lead and I mess up, I start over and do it again, because it just won't have that organic, crazy vibe if you don't. You lose something in the emotion and "soul" when you start to cut and paste, and to me soul is EVERYTHING.
Same with vocals. If I mess up a vocal, I usually just start over, because it is really hard to maintain the intensity or passion of a vocal with cut and paste. Some people tell me they do it, and spend all this time on edits and pitch shifting, and I say to myself "Yeah, it sounds perfect, true, but where's the rock and roll gone to?"
Acoustic guitar?
Fuhgetaboutit...
Start over man...
