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.
It's also possible to process left and right differently in a way that not only gives a wide stereo effect, but also collapses right back to the original signal when mixed to mono. Nifty!
Cutoff setting for the filter, the distance between each peak.
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.
The stereo setting flips the polarity setting for the right channel, allowing the the comb filter to be used for mono compatible stereo widening.
The dry/wet mix of this effect. A lower value will let some of the unmodified signal through.
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