bstop1~ band-stop filter A notch, or band-stop, filter performs the inverse of a band-pass filter. It lets all frequencies except those within it’s defined frequency band pass through. As you can see by looking inside this abstraction, all you need to do is subtract the band-pass filtered signal from the original signal.	from the library : Jimmies Format : Abstraction Environment : max / msp commercial Max 3.x / 4.x http://forumnet.ircam.fr//rubrique.php3?id_rubrique=65