@scook...
Pretty much everything I'd use this on at the moment is single note so yeah... if the stereo trick works I'll owe you yet another proverbial "one". lol
As far as re-amping a DI signal after the fact the cableing and looping and whatnot would really be a challenge with this set up if it would work at all. I think MAYBE I could use the effects ins on the head but I'm assuming the results wouldn't be the same and the only other input is the main jack.
You mentioned you were curious about creating intervals with an audio signal using Melodyne (if I read that correctly). If you watch the Berklee vid Craig Anderton did a while back he actually does this with vocals to get some vocal harmonies on a cover of Can't Explain that sounds REALLY cool (I think that's the vid anyway... might have been something else he posted).
I figure accomplishing this with a bass part would get some good results as well. I like bass chords in general but having two strings ringing at the same time doesn't always sound as awesome as I think having the EXACT same plucked note pitch shifted will sound. It's just I've never really had the tech or know how to accomplish such a thing. Melodyne seems like a good tool to play around with this type of thing.
I still have some comping/flattening to do on these parts before I try this which I was going to do today but I seem to have given myself food poisoning so I'm just kind of being a lump today.
Stupid frozen hand me down perogies. :-/