There's seems to be a serious lack of open-source pitchshifting plug-ins for Windows.
I've found a Windows VST build of AutoTalent, but it's 32-bit and doesn't work in 64-bit Ardour.
They attach a full VS project, but I don't have a license, and I don't know how to build it...
Could anyone help me with this? :D
(linked from KVR)
http://www.olilarkin.co.uk/downloads/oldplugins/autotalent/