comb1~ comb filter A comb filter creates equally spaced peaks or troughs in the output signal's frequency response at each multiple of the peak width (a frequency value in Hz). This is done by adding a slightly delayed version of a signal to itself, which causes regularly-spaced phase cancellation in the signal’s spectrum. Negative values for the intensity parameter cause the center frequency of all peaks to be shifted by half the peak width (i.e. the troughs occur at each multiple of the given width). The comb1~ module is a basic FIR (finite impulse response) comb filter which is much simpler than MSP’s standard comb~ object. Usually, more than one comb1~ will be needed to produce enough volume for any musically useful filtering effects (it has a potential gain of 2).The help file shows how its gain may be boosted by connecting three (or more) in series.

from the library : Jimmies Format : Abstraction Environment : max / msp commercial Max 3.x / 4.x http://forumnet.ircam.fr//rubrique.php3?id_rubrique=65