COMING SOON: MODOR'S COMB FILTER IN A EURORACK MODULE!
ALREADY OUT: MODOR'S FORMANT FILTER IN A EURORACK MODULE
MODOR MUSIC MAKES A SIDESTEP TO THE SPECTACULAR WORLD OF MODULAR SYNTHESIZERS...

 

MODOR EURORACK MODULES

We received the question quite a few times: 'When will you break up the Modor NF-1 in Eurorack pieces?' Well, we 're not going to build Eurorack modules for everything there is in the NF-1, there are plenty of good oscillators, LFO's, ENV's, etc out there. But we tought some of the NF-1's building stones are that special and unique we can't leave the modular world deprived of it ... :-)

So, here we are: Modor's Eurorack Modules. A Formant Filter module is already out and in the shops, a Comb Filter module is ready and will be released very soon, and a Noisy Oscillator module is in development!

COMB FILTER

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 rhytmically undulating spacy voltage signals... Check it out!

EURORACK
  • Width: 14 HP
  • Depth: 12mm
  • 140mA +12V
  • 20mA -12V
POLYPHONY
  • Or: 2-voice polyphonic
  • Or: stereo
FRONT PANEL CONTROLS
  • 5 rotary knobs
CONNECTORS
  • 2 audio inputs
  • 2 CV inputs
  • 2 audio outputs

The center 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.

 

FORMANT FILTER

Modor's Formant Filter is a special filter that does a kind of 'vowel morphing' between three vowels. The big central FORMANT control is responsible for that, and on the Eurorack module there's of course a CV control (with attenuation) on this parameter.

You can imagine a formant filter as a set of parallel bandpass filters, picking up and amplifying a set of small frequency bands. For example, with these frequency bands around 750Hz, 1200Hz and 2800Hz, you get the sound of an 'A'. So far, nothing special. There are more formant filters around composed of a set of parallel bandpass filters.

It gets more interesting when you're able to 'morph' between different sets of those formant frequencies. Behind the central FORMANT control, there are 3 of those sets of frequencies. One at full left, one in the middle, and one fully right. So you can for example morph between A-E-O. Or U-I-E. Or AO-UI-EU. Or ...

That's what it does: morphing between different sets of formant frequencies, and that's why it sounds a lot more genuine vowelish than many other static bandpass combinators.

There are 10 preset vowels, that can be selected with the VOWEL button: A-E-O-I-OE-U-EI-EU-AO-U-UI. The vowels of the Dutch language... :-)

The 1-2-3-4 controls on top give you the possibility of composing your own vowels by manually adjusting the frequency bands.

EURORACK
  • Width: 16 HP
  • Depth: 12mm
  • 140mA +12V
  • 20mA -12V
POLYPHONY
  • Or: 2-voice polyphonic
  • Or: stereo
FRONT PANEL CONTROLS
  • 6 rotary knobs
  • 2 pushbuttons
  • 3 indicator leds
CONNECTORS
  • 2 audio inputs
  • 2 CV inputs
  • 2 audio outputs

The center big FORMANT control does the morphing between the three vowels, the AMOUNT control sets the amount of CV modulation for this control.

The three leds above the buttons show which of the three vowels is selected for editing. That depends on the position of the FORMANT control.

The VOWEL button chooses which of the 10 factory presets go into the active vowel. SHIFT+VOWEL saves all the actual settings to be reloaded when the modular system is powered off and on.

The 1-2-3-4 controls select the 4 frequency bands of the active vowel. SHIFT+1-2-3 sets the presence of the first three frequencies, SHIFT+4 sets the volume of the active vowel.

 

DEMO SOUNDS

A few basic demo sounds of our Eurorack Formant Filter. First a clean sawtooth melody without filtering, next a few examples of the same melody treated by the formant filter.

See a prototype module of the Formant Filter in action at Superbooth '17 in Berlin. Video report by Sonicstate. More video's coming soon!

 

           
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