[LAU] FX question

Hello everyone! I wonder could anyone help me here. I'm looking for a special effect in this song (sorry no better version found on youtube): http://www.youtube.com/watch?v=lOWRFAu4xts It's around 16-17 seconds. Is that some kind of delay split by frequency. I once heard something a bit similar done with freqtweak. I'd be greatful for any help. Even better if someone roughly knows how to achieve it with some commandline utility (csound, etc.). Kindly yours 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