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 -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de