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Sound Processing

The sound processing category includes modules that modify incoming audio signals. It features classic components like filters, as well as resonators or ring modulators. Whether legendary designs from Cwejman, experimental circuits from Rossum, or simply good modules from Doepfer—the choice is truly extensive. The wide range of possibilities for connecting individual components—whether for audio or control signals—enables unique results when using modular systems.
Filter products
Hexinverter Électronique-Hexinverter - Red Dragon 160245_1
Red Dragon
Hexinverter
This -24dB per octave steep low pass filter has been realized around a unique and curious Soviet-era filter core design. Being more a characteristic filter rather than a ultra-precise tool it is really great for strong sound coloration

€289.00

Currently unavailable

Net: €242.86
Details
AJH Synth-AJH Synth - Sonic XV - BLACK 160204_1
Sonic XV (black)
AJH Synth
Version in black vintage design The Sonic XV is a -24dB per octave steep diode filter with voltage controllable resonance. The filter circuit originates in the less-known vintage synthesizer Musonic Sonic V which has a quite different character from trans […]
Color

€359.00

In stock

Net: €301.68
ACL-ACL - Dual State Variable VCF 160049_1
Dual State Variable VCF
ACL
The Dual State Variable VCF consists of two multimode filters with high-pass, band-pass, notch and low-pass outputs. The circuits feature an edge steepness of -12 dB per octave. Routing options allow serial or parallel connection.

€598.00

Currently unavailable

Net: €502.52
Details
Rossum Electro-Music -Rossum Electro-Music - Evolution (Silver) 160007_1
Evolution
Rossum Electro-Music
1973 - Dave Rossum tackles the core of Moog's cascade filter, revises the rest and uses it as a base for the 2100 low pass filter from the E-Mu modular system. 2015 - the evolution of the 2100, Dave's favorite filter, takes place and the result is just th […]

€539.00

Pre Order  

Net: €452.94
Details
Intellijel Designs Inc. -Intellijel Designs - Polaris 150310_1
Polaris
Intellijel Designs Inc.
This multi mode filter is based around four cascaded OTA filter stages providing a maximum slope of -24dB/octave. There are individual outputs for low-, band- and high-pass but outstanding is the assignable Multi output which offers 27 different filter ty […]

€255.00

Pre Order 15 November 2026

Net: €214.29
Radikal Technologies -Radikal Technologies - RT-451 Dual Multimode Filter 150304_1
RT-451 Dual Multimode Filter
Radikal Technologies
Both flexibility and character are main assets of this dual multi-mode filter module. Of course you can use it as two individual filters but smart normalizations, a common cutoff coupler knob and polarizers at the cutoff CV inputs allow for the use as an […]

€389.00

In stock

Net: €326.89
Make Noise -Make Noise - LxD 150275_1
ARCHIVED
LxD
Make Noise
The LxD in a narrow 4HP module in which two different Low Pass Gates carry out their daily task. They were designed to operate independently or combined to form the back end of a synth voice

Product is archived.

Details
Doepfer Musikelektronik GmbH-Doepfer A-124 Wasp Filter (Special Edition) 150220_1
A-124SE Wasp Filter
Doepfer
Special Edition in black-yellow design paying tribute to the original EDP Wasp's color scheme. A multimode filter is based on a very special filter circuit used in the EPD Wasp, an English synthesizer of the late 1970ies
Color

€88.00

In stock

Net: €73.95
AJH Synth-AJH Synth - MiniMod VCF - BLACK 150120_1
MiniMod VCF (black)
AJH Synth
Version in vintage black design Faithful clone of the early Minimoog lowpass filter with all transistor pairs selected and matched by hand what was nt the case with the later Minis. The circuitry runs internally with exactly the same operational voltages […]
Color

€295.00

In stock

Net: €247.90
4ms Company-4ms Spectral Multiband Resonator (SMR) 150089_1
Spectral Multiband Resonator
4ms Company
A Eurorack resonator with highly musical functions: The 4ms Spectral Multiband Resonator offers much more than a typical filter bank

€439.00

In stock

Net: €368.91
Befaco-Befaco - BF-22 Sallen-Key Filter 150078_1
BF-22 Sallen-Key Filter
Befaco
Befaco's dual low/high pass filter BF-22 is inspired by the filter of the early MS-20 which is based on the Sallen-Key filter topography. The tendency of sound is obvious- the filter freaks out, screams and is pretty dirty

€219.00

Pre Order  

Net: €184.03
Manhattan Analog-Manhattan Analog - Discrete SVVCF 130566_1
Discrete SVVCF
Manhattan Analog
Long-awaited and stunnigly beautiful State Variable Multimode filter built around transistors, combining the likewisely transistor-based mixer of Moog's CP3

€258.00

In stock

Net: €216.81
Doepfer Musikelektronik GmbH-Doepfer A-101-6 Opto FET VCF 130557_1
A-101-6 Opto FET VCF/Phaser
Doepfer
Like any module of the 101-X series also Opto VCF resorts to opto-electronic parts but in this case so-called Opto-FETs are used instead Vactrols which have a avery different behaviour. The module consists of six 6dB filter stages arranged in series

€103.00

In stock

Net: €86.55
TouellSkouarn-TouellSkouarn - Kala Goañv 130481_1
Kala Goañv
TouellSkouarn
Touell Skouarn's idea of a fiter is, as expected, pretty weird as it is based on an inductor. According to this unique design the sound is extraordinary and somewhere in between a phaser-ish band pass, distortion and a gnarly wahwah with a vintage charact […]

€179.00

In stock

Net: €150.42
Verbos Electronics -Verbos Electronics - Dual Four Pole 130388_1
Dual Four Pole
Verbos Electronics
These old school 24dB filters take you on a time travel into the 60ies, directly into the tape music studios! Left-hand a high pass, right-hand a low pass; they can't oscillate but growl and screech a lot

€529.00

In stock

Net: €444.54
Frequency Central-Frequency Central - XVCF 2_130287_
XVCF 2
Frequency Central
Unbelievably lovely sounding clone of the lowpass filter from the Roland 100m with additional phase-invertted 12dB output. In the new version, the module features a total of three audio inputs and three control voltage inputs

€239.00

In stock

Net: €200.84
STG soundlabs-STG Soundlabs Post Lawsuit Lowpass Filter 121036_1
Post Lawsuit LPF (Eurorack)
STG soundlabs
Excellent sounding reproduction of the low pass filter known from the later models of the ARP 2600. It´s not the Moog cascade filter ARP used first but their own fantastic design

€255.00

In stock

Net: €214.29
STG soundlabs-STG Soundlabs Sea Devils Filter 121037_1
Sea Devils Filter
STG soundlabs
Replica of a 3-pole diode lowpass filter from a British suitcase synthesizer

€266.00

In stock

Net: €223.53
Make Noise -Make Noise - Optomix (Rev.2) 120871_1
Optomix (Rev.2)
Make Noise
The Optomix is a direct coupled, two channel low pass gate utilizing 4 vactrols to provide simultaneous voltage control over amplitude and frequency content of a signal. It is in essence, a VCFA

€235.00

Out of Stock

Net: €197.48
Details
Manhattan Analog-Manhattan Analog - MA35 VCF/A 120809_1
MA35 VCF/A
Manhattan Analog
The MA35 module is a combination of an analog VCF and a VCA. The filter section is based on the Korg35 filter as used in the legendary Ms-10 synthesizer. It is switchable between lowpass and highpass, has two audio inputs and creates the classic Korg soun […]

€208.00

In stock

Net: €174.79
HOT SHIT
FSH-1
FSH-1
Cwejman Music
High-Precision Analog Frequency Shifter with Ring Modulator Mode.

€940.00

Out of Stock

Net: €789.92
Details
Filters
MMF-6 Multi Mode Filter
Cwejman Music
The Cwejman MMF-6 is a flexible multi-mode filter with six simultaneously available filter types at individual outputs.
Farbe

€940.00

Out of Stock

Net: €789.92
Details
Analogue Systems-Analogue Systems RS-500e EMS Filter (Dual Bus) 120264_1
RS-500e EMS Filter Dual Bus
Analogue Systems
Genuine EMS Synthi filter. This legendary filter can be switched between pre 1974 and post 1974 filter type and response. For the first time response can be voltage controlled which was designed on the circuit board but not available on the matrix. This m […]

€279.00

Currently unavailable

Net: €234.45
Details
Analogue Systems-Analogue Systems RS-100S LPF Mk3 (Dual Bus) 120228_1
RS-100S LPF Mk3 Dual Bus
Analogue Systems
This low pass filter is a very good -24dB/octave Moog filter, based on the classic Moog cascade with selected, low-noise transistors

€329.00

In stock

Net: €276.47
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