Hi Tim, --- Tim Beauregard <helycos(a)yahoo.co.uk> wrote: That's a pretty good sized file. For smaller files I've used the Rezound Arbitrary Fir Filter (AFF) and jaaa. With jaaa you can visually identify frequencies where the noise exists and then use the AFF to draw a cut in that range, and then experiment with how far you can cut before the filter damage is greater than you can live with. If the audio has breaks where air conditioning units are feeding mics, jaaa will definitely show that noise. In this situation it's easy because the noise might be isolated where nobody is talking. Good luck, ron __________________________________ Do you Yahoo!? The all-new My Yahoo! - What will yours do? http://my.yahoo.com