FFTease is a collection of externals that do various kinds of spectral sound processing - cross synthesis, spectral sampling, spectral shaping, spectral tuning, spectral reanimation, and so forth. The externals were originally designed for MaxMSP by Christopher Penrose and myself. The new version (FFTease 2.5) is designed for both Pd and MaxMSP. It has been compiled for Linux, Mac OSX, and Windows XP.
FFTease 2.5 is available at:
http://www.arts.manchester.ac.uk/subjectareas/music/academicstaff/ericlyon/s...
or
Best,
Eric
p.s. For various reasons the source code is not posted at the above site, but anyone who is interested is welcome to contact me offline.