This one totally slid under the carpet for me. I had been waiting for the Ample Sound sale to hit, and that happened shortly after this post.
I didn't get to look at Vielklang too much, then checked out a couple videos on both Vielklang and Melodyne. Melodyne isn't automatic by any means, but can do the same things and there are a few videos that show nearly identical work flows to achieve this (just more work to do so). I would not use this feature much, but when this sale hit, there was also a side discussion going on regarding background vocals.
Ample Sound distracted me on this one (been waiting 9 months to grab AG12), but that is easy to do. Oh look... a squirrel!