Cinelerra has some surround panning options and offers to render it to ac3 but I didnt tested it yet. Cheers, Malte -- Malte Steiner media art + development -www.block4.com- next events: concert 29.dec 2006 Notstandskomitee vs. TBC Hoerbar Hamburg more at blog 4, also available as rss feed: http://java.block4.com/blog4/