The Direct Note Access feature coming in the new version of Melodyne is exactly what sample-based producers like me have been waiting for. We doubted it’s possibility, but it’s here. Change pitch on notes IN a chord. Not just monophonic material, polyphonic. Yeah…
Here’s a presentation
I urge you to watch the whole thing, but for the crazy shit, fast-forward to about minute 10, for a string quartet demo, damn!
For a more concise explanation, check out the video on their website.
Matt Marks Music 
holy shit, by the way
“I thought if we can hear it, the program must be able to do it as well.”
What programmer thinks that way? It’s pretty bad ass.
I wonder how it deals with unisons, but still, it makes regular old Melodyne look like E.T. for the 2600.