#StudioEquipment - Modor Comb Filter Module (Modor) ~ Lurid House Live

What is a Comb Filter? It is a digital filter where the input signal is mixed with a slightly delayed version of the input signal. You won't hear it as some kind of an echo, as this delay is very short (40ms at max). But the mixing process creates a number of equally spaced peaks and holes in the frequency spectrum, that make it look like the teeth of a comb. That's where the name 'Comb Filter' comes from.

Comb filters are typically used to make chorus and flanger style effects. These effects are created by modulating the delay time. With longer and relatively fast modulated delays you receive a chorus effect. With short to very short slowly modulated delays, combined with some feedback you'll get the typical sound of a flanger unit.

So, the most interesting parameter in this is the delay time. That determines the frequency spacing of the comb teeth. So that's why there's a CV control for it. The typical chorus and flanger effects are made by modulating the delay time with a triangle LFO. So there's a triangle LFO onboard the module, with speed control. If you don't enter any CV in the CV1 connector, it is normalled to this internal LFO to make typical effects. CV2 is normalled to the reverse signal of CV1, to make Modor's typical wide stereo effects, just as on the NF-1 synthesizer. But of course, you can enter your own CV signals in there: LFO's, Envelopes or some rhythmically undulating spacy voltage signals...

The centre big DELAY control sets the delay time, the DEPTH control sets the amount of CV modulation of the delay time. DEPTH can go positive and negative.

The MIX control sets the dry/wet mix. The FEEDBACK controls the amount of feedback. It can be set both positive and negative. The SPEED control sets the pace of the internal triangle LFO.

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