Sound Parameters – Filter TypesWaldorf Q User’s Manual 92FrequencyLevelCutoffPicture 30: Notch Filter TypeOn Notch filter types, the Resonance parameter is almost useless by definition because the resonancefrequency is exactly the frequency that is blocked by the filter. However, you will still be able to hearslight differences when you change the Resonance because of phase changes. Anyway, the effect isn’tthat spectacular.Comb+ and Comb-The Comb filter types differ from the other filter types greatly because they actually don’t damp anypart of the signal but add a delayed version of the input signal to the output. But what is a Combfilter?A Comb filter is basically a very short delay that can be controlled in length and feedback. The delaytime is so short that you can’t hear its individual taps but a colorization of the original signal createdby peaks or holes in the frequency spectrum. The frequency of the colorization is set by the delaylength which is controlled in the Q through Cutoff while the amount of colorization is set by theComb filter feedback, which is controlled in the Q through Resonance.FrequencyLevelCutoff determines number of teethResonancePicture 31: Comb + Filter Type
