Hi!
csound can do it as well. I believe, that if you don't give real file names
in the orchestra-file, you can process a bunch of files.
And there's a set of fft-based utility programs, that can do it. They have a
flaw in that they only support the .snd format, but that's manageable, with
sox or sndfile-convert, without loosing quality. It's either the POWERpv or
PVC package, see
http://linux-sound.org
Click on DSP software and go down to "FFT/Phase Vocoder".
HTH.
Kindest regards
Julien
--------
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