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Grendel Formant Filter

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Page last updated Feb 15, 2026

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Description

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Four analog bandpass filters in parallel which stamp a strongle vocal character to your audio. The filters can't be controlled individually, in fact a special CV processor is used to determine first the size of the "mouth" and second to select the vocals.

A very stunning module with a special character and an awesome, liquid, organic sound.

Details

If you get involved in phonetic vocal trapezoid and how vovels are generated in the mouth the principle of the Grendel Formant Filter becomes clear: The Size parameter influences the size of the virtual mouth by shifting all filter cutoff frequencies parallelly. The parameters Articulator X and Y refer to the international phonetic vovel diagram (see links) and select the desired vovel. All three parameters can be voltage controlled and are optimized to -/+5V voltages (but can handle up to -/+10V), yet the articulators work best either in the range of 0...5V or -2.5V...+2.5V

Frequency-rich signals like sawtooth and noise is recommended. Great for close simulation of human vocals are asymetrical triangles with leading edge shorter than the trailing edge. This can be achieved with function generators like Maths and Function or the RS-95e VCO. connectors

audio: input and output CV inputs: Size, Articulator X and Articulator Y dimensions

3U Eurorack module, 12HP wide, 30mm deep power consumption: each 65mA @ positive and negative rail Weight 0.3 kg Article Number GRff

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EA78751

Grendel Formant Filter - Voltage Language

EA78751

Modular Wild Presents SOUNDS-GRENDEL FORMANT FILTER

Modular Wild

Modular Wild Presents SOUNDS-Grendel Formant Filter Modulation

Modular Wild

Modular Wild presents PROFILE- Grendel Formant Filter

Modular Wild

Grendel Formant Filter Drone

Ebotronix

Grendel Formant Filter Freq

Ebotronix

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Grendel Formant Filter.

Features and functionality

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The Grendel Formant Filter has multiple versions, each capable of producing distinct vowel sounds by using resonant filters and audio rate FM modulation.
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The Grendel Formant Filter can emulate human vowel sounds by manipulating three bands, mimicking the mouth and nasal cavities' resonant frequencies.
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Owners note that the Grendel Formant Filter can effectively create vowel sounds by moving resonant peaks with square waves, emphasizing the need for high-frequency FM.
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The Grendel Formant Filter is praised for its ability to mix in white noise, enhancing the intelligibility of vowel sounds, especially when using midrange drivers with broad frequency response.
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Comparisons

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The Grendel Formant Filter is often compared to the XAOC Belgrad for producing vowel sounds, particularly in dual band pass mode.
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The E-mu Morpheus and its Z-Plane filter are highlighted as strong alternatives for producing vowel sounds, with standalone versions available as Eurorack modules.
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Use cases and applications

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Some owners use the Grendel Formant Filter in conjunction with a CV Step Sequencer or a Midi to CV/Gate converter for dynamic vowel modulation.
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The Grendel Formant Filter is recommended for use in combination with FM synthesis, utilizing higher-pitched carriers to generate rich formant sounds.
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