Sound Processing

The Matrix VCF is no ordinary filter. What AJH Synth delivered here is the result of two years of meticulous development - sixteen different filter types with two distinct resonance models per type, totaling an extraordinary thirty-two filter variations. Not just an Oberheim Matrix 12 filter clone, but an evolution that takes the classic design into a new ballpark. The Matrix VCF features the rare and highly sought-after Oberheim Matrix 12 filter topology, expanded with several additional modes and new tonal possibilities. The sixteen filter types are clearly indicated by illuminated LEDs on the front panel, with filter selection possible via both manual control and external CV. The low-pass, high-pass, band-pass, notch, and combination filters are all here, plus AJH added a four-pole all-pass phaser mode not found in the original Matrix 12. The Matrix VCF, features something called the "P-Vox" switch. Engaging this mode completely transforms the resonance behavior, introducing distortion and overdrive inspired by Soviet Polivoks circuits. When P-Vox is activated, all sixteen filter types can be pushed into self-oscillation, producing harmonically rich waveforms far beyond the usual sine waves. This effectively doubles your filter palette to thirty-two distinct variations, ranging from smooth and musical to screaming and aggressive. The interface is as straightforward as can be and should leave very few riddles behind. Six solid control knobs manage frequency, mode selection, resonance, CV levels, and input/output levels. There's a row of sixteen LEDs that provide visual feedback about which filter type is currently active - definitely helpful when using external CV to switch between modes. Speaking of CV, the module offers you six CV inputs, including a 1V/Oct input that lets you use the filter as a tracking oscillator when in self-oscillation mode. A built-in VCA on the output is also there with a peak LED that helps you dial in your signal levels without unwanted distortion. In use, the Matrix VCF is capable of a whole host of classic filter tones - and then there's the more unusual complex combination filters like "Three Pole High Pass combined with One Pole Low Pass" to create unique timbral sounds rarely found in other filter designs. When P-Vox mode is engaged, even familiar filter types take on new life with a distinctly raw, analog character. This is simply an outstanding selection of filters, housed in a premium module. Features: 16 distinct filter modes based on Oberheim Matrix 12 topology P-Vox (Polivoks) resonance distortion circuit doubles the sonic palette to 32 filter variations Visual feedback via 16 LEDs showing the active filter type Manual and CV-controllable filter type selection Multiple CV inputs for frequency control (1V/Oct, 1/3, 2/3, Freq CV) Self-oscillation capability in P-Vox mode with 1V/Oct tracking Integrated VCA with dedicated CV input Input and output level controls with peak LED indicator All-analog signal path with premium components

Arad by XAOC Devices is an expander for Oradea that gives you 3 additional features.

Oradea by XAOC Devices is a quadruple voltage controlled analog resonator. You can use it to enhance external audio or to generate tones.

Very interesting filter for all those who cannot decide between a Moog filter and a MS20 filter or are looking for something in between.

NANO's OCTA — Four Voices of 808 Spirit in Modular Form

A legend! The RES-4 is a combination of 4 resonant filters. An inspiring Tool made in Cwejman high quality.

Euterpe Itinera offers saturation, distortion, multimode filter, changeable resonance paths and feedback functions.

The Octopass by Tiptop Audio delivers the coveted sound of classic synthesizers through eight channels of professional 24dB/octave low-pass filtering based on t

Serge NEW GATES / VCFX 2023 — Dual Function Sound Sculptor. Serge Tcherepnin revisited his classic Gates design from 1973 and has now created something special

Tobinski Dual LPG/VCA - brings together Buchla and Moog designs.

The first iteration of the 292t was not allowed to be sold in the EU because of some parts that were used. Now there is a special version of the Quad Lopass Gate! As with all modules from the Buchla and Tiptop Audio collaboration, the 292t is very close to the original circuit. We get four channels with lowpass gates that are switchable between the LoPass filter setting, the Gate setting (linear VCA) and a Combo of both - basically the lowpass gate setting. Of course, there are also four audio inputs and outputs as well as four CV inputs. These control the amplitude, the cut-off frequency of the filter or both in Combo mode. The mix output is configured to sum the four channels as a 4-to-1 mixer. Now look at the name again - this is an original Buchla Lowpass Gate. Now finally available for Eurorack, thanks to the collaboration with Tiptop Audio. Exciting times! Features: Four-channel VCA, lowpass filter or lowpass gate Mix output (4 to 1) Can be used as a quadrophonic mixer

The Metamorf is a fascinating filter system from Alfa Delta. It's designed around six highly precise digital state-variable filters. Each filter can be tuned to exact frequency ratios or fixed values down to a single cent. This makes harmonic relationships between filters possible that would be nearly impossible with traditional analog designs. The modulation system is another really interesting aspect of this module. Anything can modulate anything else - CV inputs, filter outputs, mixers, MIDI messages. Want one filter to frequency-modulate another? Easy. Need to create complex amplitude modulation effects? No problem. The module also handles through-zero linear FM for instances when you want to reach those metallic, bell-like timbres. You control the interface through three encoder knobs, six buttons and an OLED display. Despite its complexity, you won't find yourself lost in its menus. The interface is remarkably direct for such a deep module. The two built-in six-channel mixers are also really useful - through internal routing they let you create complex signal paths without the need for other external modules. Metamorf opens doors to filtering techniques that simply weren't practical in the analog realm. It's not trying to be an analog filter - it embraces what digital does best while remaining tactile and musical. It's got perfect tracking across 10 octaves and ability to save 128 user presets and a whole lot more — definitely worth considering if you're looking for a deep and unique filter experience. Features: Six independent 2-pole digital state-variable filters with analog ins/outs Classic filter responses: LP, BP, HP, BR (notch), PK (peak), ALL Extensive modulation matrix with exponential FM, through-zero linear FM, resonance (Q), and 4-quadrant AM Frequency control via ratio relationships or fixed steps with 1-cent resolution Two 6-input mixers with flexible routing Quantizer with 8 different scales for precise musical intervals 6 CV inputs, 2 signal inputs, and 6 digital gate inputs Perfect 1V/oct tracking across 10 octaves MIDI input for notes, controllers, pitch bend, and program changes 4-line OLED display with intuitive parameter navigation 2 banks of 64 user presets plus factory presets