posted 21 September 2000 11:32            

"I´m working on a film with a direcdtor who wants a very "natural" sounding morph from a female voice to her own ghost"

Never having heard a ghost, I'm not sure if this will sound "natural" or not, but you could try doing a spectral analysis of her voice (*not* the quasi harmonic one), and analyze at a fairly high frequency like 3 f. Then you could use the SpectrumModifier to remove some of the partials (every other one or perhaps just the lowest ones). That makes the voice sound more "spectral" but still identifiable.
Also in the Sound Library under live spectral processing, there are some bells going through an FFT with a sweep on the upper and lower frequencies that are let through. This sounds a bit spooky, especially when you put it through Eugenio's reverb.