Kilohearts

The Comb Filter hollows out the sound by carving out frequencies at each multiple of the base frequency, like the teeth of a comb. The Comb Filter will mix the signal with a delayed version of itself, creating a filter with repeated troughs and peaks across the spectrum.

Cutoff - Cutoff setting for the filter, the distance between each peak.
Mix - The dry/wet mix of this effect. A lower value will let some of the unmodified signal through.
Polarity - The polarity setting swaps troughs for peaks and vice versa, with the plus setting having a peak at 0 Hz, and the minus setting a trough at 0 Hz.
Stereo - The stereo setting flips the polarity setting for the right channel, allowing the the comb filter to be used for mono compatible stereo widening.

Minimum System requirements for Snapins
CPU: 2 GHz or faster
Memory: 1 GB or more
Operating System: Windows (7 or newer) or Mac OS X (10.7 or newer)
Software: A DAW supporting VST 2, AAX, or Audio Unit plugin standards.