Crayon Filter is a multi-band filter plug-in. The band controls allow you to add a type of filter to the output of the signal. You can engage up to five filter types at once (one of each type). Low Pass attenuates high frequencies, giving your sound a "dull" feel. Band Pass attenuates both above and below the cutoff frequency, for a "thin" or "nasal" sound, High Pass removes low frequency signals. Notch removes just a small band of frequencies from the signal. Peak boosts a small band of frequencies in your audio