Studio Equipment charts

Notes: Module A-124 is a special 12dB multimode filter using the "strange" filter circuit of the "EDP Wasp" (an analog synthesizer with black/yellow case built end of the seventies, manufactured by the UK company "Electronic Dream Plant" with Chris Huggett und Adrian Wagner). This design "abuses" digital inverters as analog operational amplifiers leading to distortions and other "dirty" effects that generate the specific sound of this filter. The filter is equipped with a band pass output and a combined low/notch/high pass output. For this output a control knob defines the relation between low and high pass signal. If both signals appear at the same level (i.e. middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates. The module does not feature self-oscillation in contrast to most of the other filters of the A-100 system.

Inputs: Audio In, CV In (2x)
Outputs: Bandpass Out, Low/Highpass Mix-Out
Controls: Audio and CV attenuator, Frequency, Resonance, LP/HP Mix

The function and operation of this module is very similar to the module SEM VCF A-106-5. But the sound of both filters is very different! The only functional difference is the position of the sockets and controls, and the function of the controls CV2 (A-124: normal attenuator, A-106-5: polarizer).

- 3U Eurorack module, 8HP wide, 45mm deep
- Current draw 30mA

Notes: The MCFx2 is ALM's state variable 'MCF' filter made double. It features 2 identical classic analog 3 pole state variable filter cores each with Low, High and Band Pass (or Notch) outputs. Direct and voltage control is provided for both filter cut offs and resonance. Switches allow the filters to function as one, with the 'Feed' switch internally routing audio from one filter to the other in series and the 'Link' switch linking the cut off controls for both filter cores. MCFx2 expands on the great sounding MCF filter to offer both serial and parallel functionality for stereo operation, dual peak, tighter slopes and other complex filtering set ups.

FREQUENCY CONTROLS
Sets the base frequency for the filter cut offs. The v/oct and frequency inputs are added to these.

RESONANCE CONTROL
Sets the level of resonant peaks atop the cut off frequencies. The resonance can get particularly aggressive going into self oscillation with the control past 12 o'clock.

OUTPUTS
Each filter output is 3 pole with an 18dB/oct slope.
Low - low pass filter outputs. Passes frequencies below the cut off.
High - high pass filter outputs. Passes frequencies above the cut off.
BP/Notch - band pass or notch filter outputs. Jumpers on the rear of the module select one or the other for each filter.
Passes frequencies within (BP) or outside (Notch) a narrow region around cut off frequency.

LINK BUTTON
Links the left cut off to parallel control both filters. The right controls will now set the max range of the right core. Both filters will track together when the right cut off is fully clockwise.

FEED BUTTON
Routes the output of the left filter core to the input of the right (unless patched), with the desired output filter type selected via jumper at the rear of the module.

FREQ INPUTS AND ATTENUATORS
Control voltage inputs here are combined with knob offsets to set the final cut off. Attenuversion control allows for both attenuation and inversion of the CV. Expects approx. -5V - 5V input.

RES INPUTS AND ATTENUATORS
Attenuated control voltage inputs here are combined with knob offsets to set the final resonance.
Expects approx. -5V - 5V input.

AUDIO INPUT 'In'
Signal inputs to the filter cores for processing.
Input sources may need to be attenuated, filter will drive from hotter input levels.
The Left input is normalised to the right (unless 'Feed' is enabled).

Notes: FONT is a massive sounding liquid filter- designed to bring you powerful basslines, tons of FM modulation and a clean resonance over your audio path.

It features two simultaneous outputs:
2-pole Low Pass
2-pole Band Pass

It can also work as a sine oscillator, tracking 1V/OCT when the resonance is at its maximum level.

FONT can be used to make basslines, acid patterns thanks to its organic and musically sounding resonance.

Ping it to produce percussion sounds such as, bongos, congas or toms.

Applying a pitch envelope, it really shines as a kick-drum machine!

22 mA +12V
25 mA -12V
0 mA 5V
15 mm deep
O 4.60 (10 Votes) Average Rating

Notes: Oof. Frap casually serve up one of the best filters we've seen in a long time. Quad multimode circuits with saturation and feedback give you extensive routing options. Delicious.

Supplier's Notes:
cunsa /'cu?nsa/ s.f. [dialect of Modena of uncertain etymology, probably from a Latin *comptiare, derived from comptus, participle of comere 'organize,' 'decorate'] i curing, seasoning (of foods), tanning (of leathers).

Seasoning is crucial for cooking. It is a process that enhances the flavors, glues the ingredients together, and even adds some unexpected kick.

From a gentle refining touch to a shovelful of spice, CUNSA is the perfect seasoning tool for your patches. It can sweeten a sour lead or beef up an insipid bass line, and anything in between.

And, just like a good oil, you can even taste it by itself!

CUNSA is a quadruple analog pingable multimode resonant filter, saturator, mixer, and oscillator.

It is Frap Tools' sound seasoning tool: it can gently even a patch, applying a final touch, or it can set it on fire with a ridiculous amount of spice. It's up to you and your cooking style!

It consists of four multimode resonant filters with a custom saturation and feedback control that you can use independently or in various combinations and roles thanks to a series of seminormalizations.

Four Analogue Resonant Multimode Filters

CUNSA features four state-variable filters that can be used independently or linked and mixed. Each filter provides three behaviors simultaneously: lowpass, bandpass, and highpass. Each behavior has a 12 dB/oct slope, except for the lowpass, which can be either 12 or 24 dB/oct.

Unique 'Character' Circuit for Feedback and Distortion

CUNSA handles feedback and gain staging with extreme control and versatility. Besides the usual Q control that emphasizes the cutoff frequency, the Character circuit defines the amount of soft clipping when the filter overloads. High clipping guarantees a controlled behavior with fat tone and pure resonance, while low or no clipping lets the signal saturate the filter stages and make it scream.

V/oct Tracking and Quadruple Oscillator

Each filter responds to the V/oct signal with excellent tracking. It is thus possible to move the cutoff frequency along with the main melody or make CUNSA resonate with no input and transform it into a multiple oscillator. The V/oct inputs are seminormalled so you can control more filters with the same CV. Easy chords stabs!

Ping and Ring

CUNSA is ideal for percussive and organic tones. The Ping circuit offers a behavior similar to the BRENSO but AC-coupled. Instead of shooting the frequency to the moon with any trig, CUNSA gently responds to different incoming gates with a selectable decay curve. The Ping circuit can thus create natural decay sounds when fed with trigs or smoother envelopes with any other voltage, like a linear integrator with a custom decay.

Besides this, you can also feed the filter's audio input with trigs and make it ring at high Q settings.

Linked or Individual Filtering

The four filters can work independently or arranged in groups through seminormalled inputs and sum outputs. CUNSA can thus be a 4×1, 2×2, or a massive 1×4 filter. Even odd configurations are possible, like 1+2+1 or 3+1. Mono, stereo, or quadraphonic audio is at your fingertips.

Filter and Combo Behaviour

When the filter behavior is set to COMBINED, every control of the cutoff frequency also affects the input VCA, reducing the signal amplitude and saturation as it approaches the lowest range. It can make organic decays with the ping circuit or tame the low range at high Q and Character settings.

Four Seminormalizations for Group Use

Four inputs have a cascaded seminormalization: audio inputs, VCA CV, V/oct, and Ping. Every signal patched to a filter will thus feed also those at its right, making simultaneous use even simpler. To remove a seminormalization, simply patch a dummy cable to the corresponding input.

Analog Mixing Stage and Group Outputs

Every filter output can be routed to an analogue mix bus that sums the four filters and outputs them in three combinations: all, 1+2, and 3+4. These outputs allow for versatile audio processing. Just like we did with FUMANA, we added a gentle shelving EQ for the higher frequencies of the All output to provide additional timbral variety.

CV Inputs with Attenuators

Besides the seminormalled inputs, every filter features additional CV inputs for cutoff frequency, Q, and Character, each with a dedicated attenuverter.

Notes: MMF is an analogue, multimode filter with a 12dB per octave slope. Its sonic character swings all the way from classic low pass to squelchy acid lines. Simultaneous outputs of low pass, high pass, and band pass filter types are provided allowing for many variations of the input signal. Whether you're looking for smooth and creamy, or resonant and wild, MMF can go there.

Notes: The Variable Q VCF (or VCFQ, for short) from Random Source is a skiff-friendly Eurorack adaptation of what is perhaps the most famous Serge filter. It is an effortlessly thick and colorful 12dB/oct multimode filter with ultra-smooth resonance that never ceases to amaze. Amazing tonal variety comes from combining outputs, automating resonance settings via CV, and adding grit using its adjustable-gain input.

Simple filtration is only one of the VCFQ's many uses, however. Its amazing trigger input turns rising-edge pulses into thick analog kicks and toms which roughly track notes thanks to a dedicated 1V/oct input. This module also becomes an ultra-powerful modulator in "Lo" mode, with decaying/syncable LFOs well within grasp using the trigger input, along with free-running oscillation when self-patched. When fed stepped sequences, sample and hold, or other LFOs, the VCFQ can even function as an effective slew limiter. And that's not all: for those lucky enough to own two VCFQs, dual-peak resonance and an ultra-thick 24dB/oct low-pass mode offer some of the most rewarding synth sounds in existence. In short, adding a VCFQ to one's Eurorack system is always worthwhile.

Features

Analog multimode filter designed in collaboration with Serge Tcherepnin
Automatic Gain Compensation and Variable Gain audio inputs
Trigger input
1V/oct and attenuverted frequency CV inputs
Attenuated Q CV input
Low Pass, Hi Pass, Bandpass, and Notch outputs
Hi/Lo range switch
This is the skiff-friendly, SMD version of the Random*Source VCFQ

Under licence from Serge Tcherepnin
Designed for High-end VCAs (THAT2180)
No matching of transistors required
No wiring needed

Dimensions
14 HP
26 mm deep

Current Draw
52 mA +12V
52 mA -12V

Notes: The compact and complete VCA. Filtering and mixing rolled into one powerful unit. The Dreadbox Eudemonia Filter is an analog wave generator processor. It provides accurate mixing capabilities and features a dual filter in series. The filters are a 24dB resonant Low Pass Filter and an 18dB non-resonant High Pass Filter - these allow you to shape your sound before sending to your output. In order to keep things in line, the exponential VCA has a peak indicator to help you reference your levels.

Power Consumption: 61mA @ +12V , 69mA @ -12V
61 mA +12V
69 mA -12V
35 mm deep
10HP

Notes: Collabing with YouTube sensation Andrew Huang, Endorphin.es offer up this impressive multipurpose processor module. Building blocks of stereo filtering, compression, reverb and more offer huge creative potential.

Supplier's Notes:
In collaboration with Andrew Huang, based on his modern music production techniques, Endorphin.es developed a creative audio processor with multiple blocks that can be moved around in order to achieve different flavours for sound design.

Processing unit without fixed structure: intuitively create astonishing and ephemeral timbres, from atmospheric rumbles to heavy or distorted textures.
Creative stereo effect processor with delay, reverb, filter and distortion with quickly explorable routing chain with single button press.
New generation ARM Cortex - M7 processor with 96 kHz 32 bit internal processing.
Lush hall and whooshing reverse reverbs with audio freeze and pre-delay.
Sidechain audio ducking envelope available both internally and externally with additional one knob single band compressor.
Tap delay with maximum delay time up to 2.5 seconds, external clock input with onboard clock divider and 1v/oct time control.
8x oversampled distortion algorithm.
Pre- and post - VCA, tone and volume controls with extra gain.

Power consumption:
135 mA +12V
35 mA -12V
0 mA 5V

Dimensions:
16 HP
26 mm deep with power ribbon cable connected.

Notes: HN VCF is a state variable filter having 12 db Low Pass, 12 dB High Pass, 6 dB Band Pass plus 18 db Low Pass marked as "LP!", because it has extra drive. All three parameters: "Freq", "Resonance" and "Drive" have dual knobs with outer knobs controlling bipolar CV amount. These affected CVs are then shown by the relative green/blue LEDs.

The possibility to have CV over "Resonance" and "Drives" makes it a very capable 6 HP filter.

"LP!" output has 6 dB steeper slope (18 dB) compared to ordinary 12 dB "LP" output. Plus it has much more drive.

Dimensions
6 HP
35 mm deep

Current Draw
55 mA +12V
65 mA -12V

Notes: After Later's redesigned take on the classic Mutable Instruments Rings module offers all the distinctive resonant synth sounds you'd expect, from strings to percussion. Great value.

Supplier notes:
This is an exact hardware replica of the Mutable Instruments Rings module.

Notes: Erica Pico VCF1, is a younger brother of Erica Black Polivoks VCF, designed on the similar topology using rare Russian op amps. As result you get a filter great for acid bass lines, screaming resonance sweeps and deep wobbles.

Features:
- Lowpass and bandpass modes
- Self oscillation
- Rare russian opamps used
- Input protection against overvoltage

Dimensions
3 HP
35 mm deep

Current Draw
12 mA +12V
11 mA -12V

Notes: A seriously versatile filter here, much more than meets the eye. Stereo, state-variable, multi-mode design gives you huge control over frequency response and stereo image.

Supplier's Notes:
Zagrzeb is a stereo multimode 4-pole (24dB/oct) state variable voltage-controlled filter (SV VCF). It offers five distinct frequency responses, three of which are available simultaneously. Spread control allows for animation of the stereo image by moving the left and right filter cutoff frequencies in opposite directions. Zagrzeb is designed to sound smooth and clean unless it is overdriven with a hot signal- however, it does not lack character! We believe it will be appreciated by fans of old Japanese synthesizers, but bear in mind that Zagrzeb is not a clone of any existing design. The four-pole state variable structure is a new development and offers unique sonic characteristics. While Zagrzeb is designed for filtering stereo signals (e.g. samples or stereo oscillators like Xaoc Devices Odessa), it can easily handle mono signals and is capable of creating a faux stereo pair thanks to a special phase shifting network at the input.

Dimensions:
8 HP

Current Draw:
70 mA +12V
60 mA -12V
0 mA 5V

Notes: ***B-STOCK: Item refurbished, repaired and in perfect working order.***


The MST Low Pass Filter is a precision analog dual slope output 2 & 4 pole filter. Simultaneous -12 DB and -24 DB outputs with CV control over all parameters. Can be used as a 1V/O sine wave oscillator

Specifications:

Current draw: V+ max 23.5mA, V- max 15.5mA

Width: 6HP Depth: 3.5cm (1.75 in)

Notes: The Spectral Multiband Resonator from 4ms Company is an innovative resonant filter which can process audio like a classic filter bank, ring like a marimba when plucked/struck, vocode, re-mix tracks, harmonize, output spectral data, quantize audio to scales, and much more...
A gorgeous ring of colored lights displays the frequency of each filter, as well as the levels and current scale selection(s).

At a glance, the SMR works like a normal six-band graphic EQ: six frequency band-pass filters are mixed together using sliders. Resonance/Q is variable, which changes the "ringy-ness" or width of the bands.

But here's where comparison stops. The frequency of each channel is treated like a note in a scale, and the six bands form a chord. Spin the Rotate knob and the "notes" circle around the scale, rotating back to the bottom once they've reached the top. Adjust Spread and the distance (interval) between each note changes. Triggers for up/down motion, CV inputs for sequencing and scale selection allow for flexible control with external modules. Morph, which automatically cross-fades between frequencies, together with variable Slew allows rhythmic clocks drive the SMR as a variable-speed evolving resonant filter.

At maximum Resonance/Q, the SMR can be struck like a gong or marimba by inputting clocks or triggers. The frequency of each channel is quantized to a scale: beautiful chords, ethereal tones and eerie ambiance flows easily. With lower resonance, the SMR can pull out particular frequency bands, and sweep these across the spectrum.

Two 1V/octave Frequency jacks allow for tracking even and/or odd bands and creating floating melodies over evolving chord bases, or complex percussive membrane sounds.

Save your settings into one of six storage banks, and recall on the fly. On startup, the SMR instantly jumps to the last saved settings. The color scheme of the lights can be adjusted, so if you prefer all white lights on your modular, you can have that (or all red, or rainbows, pastels, etc..)!

Advanced features:
- Program your own scale. The frequency of each of the 20 notes can be assigned by setting the octave, the semi-tone, and coarse and fine micro-tone. Up to 11 scales can be saved permanently in the user bank
- Adjust color scheme of the LEDs. Pick a pre-programmed color scheme or create your own using the sliders to set Red/Green/Blue values. Custom color schemes can be saved permanently
- Save your settings in one of six parameter banks. Note position, scale and bank selection, Q value, Lock settings and color scheme can be saved and recalled on the fly. On startup, the SMR loads settings from the last saved bank.
- Optional alternative filter type for a more exponential decay when plucked and different timbral qualities. Freq jacks no longer track 1V/oct in this mode.
- Slider LEDs can be assigned to display level for each channel (combination of slider position and CV on the jack), or clipping for each channel.

Notes: There is almost no modular system without at least one filter-module. You can look at them as the stars within the giant Eurorack-jungle. twinVCFilter is such a star as well. A dual filter module with flexible routing and excellent audio properties. It covers a huge range of different applications without the slightest effort.

Features and Routing:

Each filter section of twinVCFilter works as low- or highpass-filter with a slope of 12 dB/octave or as bandpass-filter with 6 db/octave. Signals can be directed in three ways through the module:

- Serial: The incoming signal passes both filter sections in a row.
- Dual: The filter sections act completely separated of each other. As if they were two individual filter modules.
- Parallel: The incoming signal passes both filters at the same time.

With these routings you can i.e. generate bandpasses or notches with variable slopes and different resonance settings or doubling the filter's slope. These are the more obvious combinations but there is a lot more to discover.

The convenient link-feature allows to couple cutoff- and resonance of both filter sections for straightforward stereo use in dual mode.

Mix section:

The flexible signal-routing is supplemented by the mix-section. Here you can crossfade both filter sections manually or by control voltages. Seamless movements from low- to highpass-filter, is as easy as crossfading from half to doubled slope. Of course you can mix two completely individual signals or toggle between them by using a rectangle-LFO-modulation.

Resonance:

Resonance is a key factor in the context of sound-shaping and sound-generation using a filter. Therefore we carefully trimmed twinVCFilter's resonance to be as musically and stable as possible. You can apply subtle frequency-dependent emphasis to signals and tear them up to self-oscillation. The latter generates a solid sine-wave which is an excellent base for percussive sounds. Possible cross-modulations significantly enhance the sound-generator features. By the way: If you are missing a vibrato-LFO in a patch, twinVCFilter can do the job.

twinVCFilter offers a huge set of features to form impressive soundscapes. It can take subtle influence to signals or massively truncate frequencies. It leaves nothing to be desired. Despite, for those who need additional possibilities we especially designed the tVCF-Extension module.

Notes: The BF-22 VCF is a dual Hi/Low-pass filter inspired by the Sallen-Key filter from the early MS-20.

DISCLAIMER: This filter brings to your modular system the character of early MS-20 sound: Kick-ass-rocking-dirty screams! It inherited not only it's amazing sound, also MS-20 noise floor. If noise floor is an issue for you, this might not be your filter.

Features:

Dual-channel Sallen-Key Filter. Inspired by the early MS-20
High and Lowpass operation.
Two CV inputs per channel with a dedicated atenuverter for the first one.
CV controlled resonance.
The first channel can be linked to the second one with the "Link" switch.

Specifications:

Current needs: +12V: 40mA, -12V: 20mA
Width: 17 HP
Depth: 30mm (including power connector)
Aluminiun, heat-treated front panel
Designed, kits prepared and completed modules assembled in Barcelona.

Notes: The Tapographic Delay is a complex multi-tap delay in the Eurorack format with a unique interface designed for live performance. It excels at transforming the simplest audio (a drone, a percussive sound) into complex rhythmic structures, meshes of organic textures, lush harmonic mille-feuilles, liquid and resonant effects.

Have you ever got tired of the monotonous repetitions that your standard delay pedal/module produced? Have you ever wished for a more complex rhythmic structure than just decaying repetition? If yes, you have come to the right place: the Tapographic Delay is an advanced effect that lets you handle repetition in a completely novel way. It is to a traditional delay what a full rhythmic sequencer (with pattern recall, velocity control, tactile input) is to a simple clock. With the TD, you interactively define the rhythm that the repetitions will follow: a velocity-sensitive sensor allows you to record, edit, modify, and sequence your own arrangements of delays. In a sense, the TD is the converse of the classic Frippertronics sound-on-sound setup popularized by Robert Fripp in the 70's: you don't play the guitar, you play the tape loop!

The Tapographic Delay is an expressive experimental instrument meant to be played in real-time, rather than a set-and-forget end-of-chain effect. Interact with it! Experiment! Push it to its limits!

Notes: The Polaris is a 4-stage cascaded OTA filter designed by David Dixon. It builds on the lineage of the Dr. Octature and Atlantis filters, but with a totally revised core and resonance control. Along with dedicated LP, HP and BP outputs it features a configurable MULTI output capable of an unprecedented 27 different filter modes.

With drive turned down the Polaris is capable of buttery smooth filtering, and the cutoff control range has been fine-tuned for playability. With the drive dialled up and the new asymmetric multi distortion circuit engaged it creates a more aggressive sound. Not content to be just a filter, the Polaris's AP phaser mode combined with frequency modulation can be used to achieve a phaser effect.

With so much versatility in a modest size, the Polaris is an ideal filter for a starter system and an excellent addition to the tonal palette of a larger modular.

Notes: TouellSkouarn Strakal Brulu is a handmade distortion and fuzz module. The great sound is due to the new-old-stock east-German germanium transistors.

Very characteristic for the module's sound if the feedback that is coupled to the feedback. The more fuzz, the more feedback - the Strakal Brulu 2 can get pretty nasty and it screams a lot at high fuzz settings and low input level. The fuzz amount can be voltage controlled, with an inverse attenuator. Input and output levels can also be set separately.

Notes: A simple noise generator and 4 band fixed filter bank.

The noise is normalled to the Filterbank input. The cutoff frequencies are matched to the Bark Filter, so that four bands of the Bark Filter correspond to a band on the Noise & Filter.

It is a small and quick noise source and pairs well with Scan & Pan and Amp & Tone.

HP : 4

Notes: This filter is based on the classic 2600 from the seventies and uses the LM3900 Norton opamp chip.

It has an audio inputs, two CV ins and an audio out.

You can control audio input level, CV levels, frequency cutoff and resonance.

It has a beautiful sound and it can go from relatively clean to dirty and screamy depending on audio signal level and resonance.

Tech specs:

- 8HP width
- 35mm depth behind front panel including the power connector
- standard 10 pin euro power +12V / -12V
- power consumption +12V 7mA , -12V 13mA

Notes: SVF 1U

Multimode State Variable Filter

The perfect 1U, multimode, voltage-controlled filter for sweet-sounding subtractive synthesis duties or to form the basis of more complex patches. Punchy, clean, and precise. Explore new sounds through the dual modulation inputs and dedicated low pass, high pass and band pass/notch outputs. This filter responds beautifully to audio rate FM and you can self-patch to get even more interesting filter responses. Adjust the Q for a sharp howl or use it as a sine VCO.

Features:

Dedicated 2-pole Low pass filter (LP) and 2-pole High pass filter (HP) outputs.
Switchable Bandpass filter (BP) and Notch filter (N) output.
Optional +6dB input boost and asymmetric clipping circuit.
PITCH input tracks 1V/Oct accurately over 4+ octaves.
FM CV input with attenuverter.
Capable of generating very low distortion sine waves from 2Hz to 20kHz when driven to self oscillation (Max Q).

Size: 20HP
Depth: 35mm
Power: 27mA @ +12V 30mA @ -12V

Notes: The DIODEFILTER is an adaption of the well-known diode ladder filter that became most popular by Roland's TB-303 bassline. And here it is for the AE modular!

Notes: The module was named Kuzmin Filter in the past as a tribute to the developer of the Polivoks, Vladimir Kuzmin. For certain reasons, the module will now be called GRUNGE Filter (due to the sound), with the circuitry remaining unchanged.

The Polivoks was a Russian synth that was produced between 1982 and 1990.This module is the AE version of the filter that gave the Polivoks a unique, rough sound.

Beyond the basic design, this filter offers some additional features:

Two different resonance characteristics, hard and soft
An FM function, that adds the input signal to the modulation of the filter
An optional overdrive for the output, making the sound even more rough and untamed.

Notes: Following in the tradition of Evolution and Morpheus, LINNAEUS represents yet another Dave Rossum innovation in filter technology.

LINNAEUS is a stereo state variable filter that provides the unique ability to linearly modulate its resonant frequency through zero into negative frequency, while maintaining stability. With extensive voltage control of nearly every parameter, Linnaeus lets you manipulate the filter's natural response curve in new ways, to create both subtle and dramatic timbral effects. And with a "one-knob-per-parameter" interface, LINNAEUS inspires sonic creativity that invites (and rewards) real-time interaction.

LINNAEUS's cutoff/resonant frequency is exponentially voltage controllable from sub-audio to ultrasonic frequencies, while its resonant gain (Q) is exponentially voltage controllable from 0dB to greater than 60dB.

LINNAEUS's channel output response characteristics are independently and continuously variable from Lowpass, through Bandpass, Highpass and Notch, to Low and High Shelving characteristics. Voltage control of the response characteristics are independently selectable for each of the two channels.

The linear thru-zero modulation is provided by an integrated modulation oscillator and/or an External Linear FM modulation input.

The voltage-controllable modulation oscillator can track the filter's exponential frequency or operate independently. The modulation oscillator's output waveform is continuously variable from Off through Sine, Triangle, and Sawtooth, to Square. The modulation oscillator output is summed with the external linear FM input and applied to the modulation index VCA, which controls the linear thru-zero modulation index from zero to 8X. The modulation index is, of course, also voltage controllable.

LINNAEUS features include:

- Ultra-wide frequency range, exponentially voltage-controllable from sub-audio to ultrasonic via precise 1V/OCT and attenuverted CV inputs.

- Thru-zero linear frequency modulation via an internal modulation oscillator and/or an external linear FM input.

- Variable linear modulation index, voltage-controllable via an attenuverted CV input.

- Resonance (Q) exponentially voltage-controllable from 0dB to greater than 60dB via 6dB/V and attenuverted CV inputs.

- Continuously variable response characteristics independently selectable for each of the two channels via individual Response Enable controls. Characteristics include Lowpass (12db/oct and 6db/oct), Bandpass, Highpass (12db/oct and 6db/oct), Notch, and Low and High Shelving.

- Voltage control of response characteristics via an attenuverted CV input. Individual Response CV Enable controls let you independently enable or disable CV control of response for each channel.

- An integrated modulation oscillator with continuously variable waveform from Off through Sine, Triangle, Sawtooth and Square. Its frequency can be exponentially voltage controlled via an attenuverted CV input.

- A Track control that lets the modulation oscillator precisely track the filter's exponential frequency.

- Stereo inputs and outputs. LINNAEUS can process a stereo signal or two independent mono signals. While the two channels share the filter's cutoff/resonant frequency, the filter response characteristics can be independently controlled for each channel.

- The solid, high-quality construction you expect from Rossum Electro-Music.

What's with the egg?

The functional description above describes LINNAEUS as originally conceived and designed by Dave. However, late in the beta testing process, Rossum's tester, Chris Meyer, raised the possibility of alternative behavior that would let LINNAEUS function as a self-contained (i.e., no input required) stereo oscillator and/or FM percussion voice with some really powerful timbral capabilities.

While Rossum were initially hesitant to try to shoehorn the new functions into the existing interface, once Dave had prototyped them, it was clear to us all that they were just too cool not to include. So, Rossum have provided them in the form of alternate firmware accessed by pressing and holding the Egg button.

LINNAEUS is 16HP wide and 25mm deep.

Power requirements (max): 155mA +12V, 36mA -12V. Reverse polarity protected.

Notes: With the MORPHEUS digital filter module, Rossum are finally able to unleash the full power of the 14-pole Z0-Plane Filters that Dave invented for the E-mu Morpheus synthesizer.

The MORPHEUS Eurorack module includes over 280 filter configurations, which are called Cubes. Each Cube is composed of up to 8 complex filters that you can picture as being at the corners of a three dimensional cube (hence the name). Morpheus gives you the ability to smoothly interpolate between those 8 filters within the cube's three dimensional space.

Due to processor limitations back in the day, the original Morpheus was capable of real-time morphing in one dimension, but interpolation in the frequency and transform dimensions were set at note-on and remained static for the remainder of the note. But even with that limitation, Morpheus offered sonic capabilities that are unmatched to this day.

With the MORPHEUS filter module, you now have simultaneous real-time CV control of all three dimensions, for dynamic timbral effects unlike anything you've ever heard before. In stereo.

Like all Rossum Electro-Music digital modules, all parameters are available for adjustment with a single button press. No menu diving.

Morpheus Specifications

Filter cubes: 289
Filters: 1000
Filter sequences: 200
Sequence steps: 20,000 Dynamically Allocated

Inputs: Audio L/R
2x 3.5mm mono socket
100kO Input Impedance

Full Level Frequency CV
1x 3.5mm mono socket
100kO Input Impedance

Attenuverted Frequency CV
1x 3.5mm mono socket
100kO Input Impedance

Attenuverted Morph CV

1x 3.5mm mono socket
100kO Input Impedance

Attenuverted Transform/Distortion CV

1x 3.5mm mono socket
100kO Input Impedance

Filter Sequencer Dec

1x 3.5mm mono socket
100kO Input Impedance
1.6V threshold

Filter Sequencer Inc

1x 3.5mm mono socket
100kO Input Impedance
1.6V threshold

Filter Sequencer Reset

1x 3.5mm mono socket
100kO Input Impedance
1.6V threshold

Outputs

Audio L/R
2x 3.5mm mono socket
1kO Impedance

Power requirements
+/-12V via 16-pin, Doepfer-style connector

Current draw
135mA +12V, 25mA -12V (maximum)

Dimensions
18HP (W); Panel to power connector (with connector plugged in) 25mm (D)

Supplied accessories
1x 16-pin, Doepfer-style cable
4x M3 screws
4x M2.5 screws
4x Nylon washers
1x Quickstart Guide

Notes: Winnows, a dual VC resonant filter with damping.

Winnows brings radical resonant filtering to the 1U row. Make your basslines growl like it's 1999. Create clean resonant tones and layers, tuned percussion, steep filtered peaks, vowel filters and more. Each filter channel comprises two state variable filter cores, the first producing a 2-Pole band-pass response, with resonance and self-oscillation amounts set by a 3-Pole feedback network. Signals are then routed through a 1-Pole low-pass damping stage to remove harshness if required. This can be routed to the channel output, or switched and routed through a second series of resonant SVF and 1-Pole LPF damping stages. This circuitry is identical per channel.

Features and uses

Steep and spiked or wide and smooth, resonant bandpass filters
Zone in on and reinforce a sound's dominant frequency, create overtones using both channels
Create sharp resonant peaks, dull or remove any harshness with VC damping
Use the resonator as a sound source by shaping and triggering tuned percussion tones or kick drums
Per channel: 2 x VCA based SVF, 2 x 1-pole damping LPF, 1 x 3-Pole resonance core
Identical circuitry per channel, CV and audio jacks are normalled between channels
Combine both channels in series for vowel filter responses and creative filtering

Specifications

Intellijel 1U format
Width 24 HP
Depth 34mm
Power requirements ~90mA +12V/~80mA -12V
Control voltage range 0-8V
Impedance Input 100K / Output 1K

Notes: Stereo version of Erica's DJ-style filter module designed with drums in mind. Simple three-knob interface gives control over joint low-pass/high-pass resonant filter with CV input.

Supplier's Notes:
As its name suggests, the Erica Synths DJ VCF STEREO module provides sound treatment functionality typically found on DJ decks - it is fully open when the cutoff knob is at 12:00. When turned counter-clockwise, lowpass filtering is applied and when turned clockwise, highpass filtering is initiated. Additionally, there is a nice-sounding, adjustable resonance parameter. This provides hands-on control over the sound during performances as well as unconventional timbre modulations that are hard to achieve with conventional state variable filters.

Features

Fully analogue stereo DJ-style VCF
Manual cutoff and resonance control
Two cutoff CV inputs, one with an attenuverter
Technical specifications:

Audio level: 10Vptp
CV level: -10V - +10V
Filter slope: 24dB/oct
Power consumption: +109mA, -101mA
Module width: 8HP
Module depth: 35mm

Notes: Variable Pole analogue filter based on Asteroid Op VCF Tech

Model: Millipede Variable Pole VCF
Analogue Filter, Can easily get Brutal tones.

What does this do?

This is an analogue filter that uses two modern equivalent ssm2164 IC's v2164 from cool audio to do it's magic. This particular filter however allows the user to vary the phase of each pole or filter cell. There are four filter cells total. This is similar to the Blue lantern Asteroid Operator Station VCF. The Asteroid Operator Station VCF has 8 Static filter out puts. Those 8 flavors were found by exploring the circuit found on the millipede vcf and internally installing the resistor ratio for that flavor.

On the millipede vcf you are allowed to find more exotic flavors yourself. Operation is easy. You first have all the poles counter clockwise and the three switches set to mute. This will have the filter as a dark Low pass filter. Then you turn on a pole using the switch and turn the know to hear the change. Pole 3 by default is always on, otherwise there would have been no sound if all poles were muted. Having all the poles set clockwise and active easily gets you into brutal sounding tones in a good way.

There is an on board diode limiter circuit to help tame really harsh tones. This is activated by switch.

The audio input has some gain, so you don't always have it fully clockwise. There is also a capacitor selector switch just like my other filters. This modifies the rez peak.

Dimensions
13 HP
32 mm deep

Current Draw
58 mA +12V
56 mA -12V

Depth: 2.5 inches

Notes: Evolved version of Maneco's drone synth uses an oscillator based on equations, a Korg MS20-inspired filter and built-in reverb. Check out the Grone Expander for added touch-sensitive controls.

Supplier's Notes:
Dark Drone Machine

Generates sound based on equations converted to analog signals, there are sixteen equations selected by Up and Down switches. Four LEDs indicate equation number in binary mode. Three Pots modify numbers used by the equation, A0, A1 and A2, fourth pot Sample Rate controls pitch and speed of the oscillation. There's an Output Level pot for the oscillator and a dedicated jack for patching the Oscillator sound to external modules.

NOISEGENERATOR:

White noise with noise level pot and noise output jack.

VCF:

MS20 resonant low pass filter, with CUT frequency pot control, RESONANCE, MODULATION1 amount pot, input and output jacks and second cv input for cutoff, labeled MOD2

LFO1:

Low frequency oscillator routed to MOD1 from VCF, RATE and WAVEFORM shape Pots.

Also routed to delay block1

Waveforms are: ramp up, ramp down, square, triangle, sine, sweep, random levels, random slopes

EffectsSection:

Delay with tap tempo and reverse component: controls for delay time, delay feedback, delay level and reverse component, tap tempo input jack for external control

Reverb with freeze button, controls for reverb level and reverb decay, input jack for freeze function

Notes: Viol Ruina is an all-analogue distortion and lowpass filter with an internal envelope follower and self-modulating cutoff. The four-pole design is reminiscent of the classic filters we all know but with a completely new and slightly ridiculous twist. The independently addressable distortion circuit takes VR into overdriven paradise with a shocking amount of drive. Built-in envelope following makes an easy way to create dynamic patches with the flick of a switch, and feedback FM takes VR to a whole new realm of filthiness. Run a sound through VR, you'll get something cool out of it.

Notes: This is an exact hardware replica of the Mutable Instruments Blades module.

This model uses the original "hard-to-find" opamps, but After Later have substituted V2164M with AS2164D. All of After Later's products use AS2164D and there should be no measurable change in behaviour.

Notes: Collabing with YouTube sensation Andrew Huang, Endorphin.es offer up this impressive multipurpose processor module. Building blocks of stereo filtering, compression, reverb and more offer huge creative potential.

Supplier's Notes:
In collaboration with Andrew Huang, based on his modern music production techniques, Endorphin.es developed a creative audio processor with multiple blocks that can be moved around in order to achieve different flavours for sound design.

Processing unit without fixed structure: intuitively create astonishing and ephemeral timbres, from atmospheric rumbles to heavy or distorted textures.
Creative stereo effect processor with delay, reverb, filter and distortion with quickly explorable routing chain with single button press.
New generation ARM Cortex - M7 processor with 96 kHz 32 bit internal processing.
Lush hall and whooshing reverse reverbs with audio freeze and pre-delay.
Sidechain audio ducking envelope available both internally and externally with additional one knob single band compressor.
Tap delay with maximum delay time up to 2.5 seconds, external clock input with onboard clock divider and 1v/oct time control.
8x oversampled distortion algorithm.
Pre- and post - VCA, tone and volume controls with extra gain.

Power consumption
135 mA +12V
35 mA -12V
0 mA 5V

Dimensions
16 HP
26 mm deep with power ribbon cable connected.

Notes: Esquivel is Bocuma's homage to space-age pop. This is a voltage controlled filter in a 14HP Eurorack, around a diode ladder topology. It is capable of switching between the 3 classic states: low-pass (LPF), high-pass (HPF) and band-pass (Band Pass).

Control cut-off, resonance and two inputs for CV. Likewise, a mixer for 3 signals was added at the input, giving it the possibility of mixing 3 different waveforms to obtain more harmonic-enriched signals and to maximize the sonic possibilities of its resonance.

Specs:

14HP
+12V > 12mA -12V > 12mA

Notes: Eurorack and Newtonian physics meet in this clever 'movement simulator' module, capable of acting as a VCO, LFO, envelope generator, filter and more.

Supplier's Notes:
Inertia is a universal movement simulator. It generates output curves from input stimuli and the weight of its own motion-that is, its inertia.

Just as Newton described the motion of the planets and the motion of earthly bodies with a single set of laws, so too Inertia brings together several seemingly disparate musical functions with a single, elegant abstraction. Inertia can be used as:

A rich oscillator with 5+ octaves of temperature-compensated V/O and CV over skew
A quadrature sine wave oscillator
An LFO divider
A filter with controllable, skewable resonance, from a light touch to screaming glitches
An envelope generator with nuanced, natural sounding control over the minutiae of the attack and decay stages
An intuitive sine wave skew LFO
A phase locked loop
A voltage controlled exponential slew limiter
A slew limiter with controllable overshoot and settling (like a Wogglebug)
A percussive sound generator
And more uses that we haven't yet discovered

Inertia achieves all this complexity with simple controls. The exponential rate at which the output rises and falls can be set by the rise and fall controls. Inertia then follows an input signal according to these two rates, producing a first order and second order output. But things get interesting with the momentum controls. When you add some rise or fall momenta, the output signal exceeds its target in that direction before returning to its destination. With momentum, you can create ADSR-like envelopes, skewed filter resonance, etc. When momentum is all the way up, Inertia self-oscillates, acting like an LFO or VCO.

In addition to rise/fall mode, Inertia can be set to value/skew mode, in which these same parameters are controlled as overall frequency, plus the skew between rise and fall rates, and overall momentum, plus the skew between rise and fall momenta. An LED colour and position indicates which mode is being used.

Inertia is inspired by the Dual Universal Slope Generator (DUSG), invented by Serge Tcherepnin for his Serge synthesizer system. Rather than duplicate the DUSG in a new wrapper, Inertia builds on the innovative, abstract impulse at the heart of the DUSG to create something different and new. This all-analogue circuit is original both in concept and execution, but it grows in rich soil.

Size: 14HP
Depth: 25mm
Power Consumption +12V 72mA, -12V 72mA
Timing Range: 50s-7ms (low), 7Hz-50kHz (high)
Tuning Accuracy: ~5 octaves
Self-Oscillation Range: -6V-+6V peak
Full I/O Range: -9.5V-+9.5V peak
Input Impedance: 50kO
Output Impedance: 150O
Output Drive: 2kO (min), 20kO+ (ideal)

Notes: Rackable (38HP eurorack) modular desktop unit.

8 CV inputs with led level indicators.

6 main functions: Prefilter / Digital / Analog / Mixer / Envelope Follower / Feedback

Prefilter: High Pass and Low Pass filters to shape the sound before being processed. Both controllable via fader + CV input.

Digital: 12 bit Bit Crusher / Bit mute, Biswap and Bit inversion + Sample Rate reducer. Both controllable via potentiometer and CV inputs. It also offer an analogue input control with led clip indicator and a low pass filter to smooth the output signal. All the code will be Open Source

Analog: 7 analog distortion circuits selectable with a rotary encoder + a sweet resonant state variable filter. Drive and Cutoff parameters are controllable via potentiometer and CV inputs. 2 of the circuits use the new Korg NU-TUBE.

Mixer: Dry and Wet controls to mixed the processed signal with the clean one of the input. Both controllable via fader + CV input.

Envelope Follower: A dedicated envelope follower with gain control and normal and inverted outputs to convert an incoming signal to an envelope. With its output you can control any of the CV parameters and shape the processed sound in many creative ways.

Feedback: a triple feedback section that sends the Wet input to the Prefilter, Digital and Analog sections. It's capable from a subtle resonance to a collapsed hardcore self generating tone.

Semi-modular architecture with pre-patched sections that can be restructured using patch cables. Each section (minus the feedback) can be used as an independent function from the rest.

Dimensions
38 HP

Current Draw
195 mA +12V
160 mA -12V

Notes: A unique analogue take on granular synthesis, inspired by Yannis Xenakis, the Grainity pairs a granular filter with a multimode filter to create new textures and harmonics.

Supplier's Notes:
The Grainity brings a unique and never-heard-before concept to the world of analogue VCF.

While being based on analogue filtering only, the Grainity expands and enriches the sound in creating subharmonics, harmonies, unison, flanging effects and formant filtering all at once.

The module presents two sections, the granular filter itself and a typical multimode filter, each with its own output.

A third output offers a mix of both filter paths. Numerous controls and CV allow a very wide palette of results.

What is the Grainity

Granular?

The word granular was chosen for this filter module in relation to the concept invented by the composer Yannis Xenakis, and which is described as assembling small chops of sounds - he called grains - according to a pattern.

This is exactly what the Grainity does, no more no less ... but, digital control allows doing it in ways that are decades away from what tape and scissors allowed at the time.

Technology wise ...

In the granular section, the incoming sound cycle is determined in order to step through various filtering and phase variations of itself according to predefined patterns called structures.

The controls allow alterations to the cycling phase, cycling frequency offset (tuning), structure selection and frequency division of the filters cycling. This comes in addition to the usual filter frequency and resonance controls.

What the Grainity is not

Technology wise ...

Despite relying on a microprocessor, the Grainity is not a digital audio processor. At any time, the sound remains in the analog domain and goes through analog circuits from in to out.
The digital processor does not convert or generate audio signals; it is there to control the analog circuitry and manage the interface and display.

Sound wise ...

Several digital modules offering granular processing rely on the layering of sound grains, which leads to blurry and cloudy textures.
Layering of the grains is a late addition to the concept of granular synthesis and is not a mandatory feature of the concept.
The Grainity does not use delay lines or sampling memory but is nevertheless true to the foundations of the granular synthesis concept.

The granular VCF in the Grainity is unconventional in that, most of times, it is not filtering the sound in the common expectation of removing something. Typically, the granular process adds more than it removes by expanding both the lower range, creating subharmonics, and the upper harmonic contents in multiples ways.

Dimensions
10 HP
21 mm deep

Current Draw
101 mA +12V
59 mA -12V

Notes: The OpticTone is a combination of a 12dB multi-mode Vactrol Filter and a Vactrol Voltage Controlled Amplifier.

It is a completely original circuit inspired by the singular nature of Vactrols and their fluid and natural character.

The Filter section provides the three fundamental filter types: Lowpass, Bandpass and Highpass.

A Resonance knob with voltage control input is available for improved modulation flexibility. The feedback knob interacts with the Resonance path, tempering it from creamy resonance to wacky self-oscillation.

Filter and VCA run in parallel, both are controlled by the Freq/Amp knob and it's associated voltage-control input. The combination of both signals can be crossfaded with a dedicated knob.

The Freq/Amp is also controlled with direct touch control on the panel via the 3 lines below the knob.

The filter frequency control can be inverted by the Inv Freq switch, providing the possibility to change the filter direction. This feature allows the filter to "close" when the VCA is "opening" or the other way around.

The Ping input allows to generate the well known vactrol filter percussive sounds if a gate or trigger signal is provided. The Ping frequency if controlled by the Freq/Amp knob, ranging from low kicks drums to high pitch bongos.

There is also a Drive knob to take care of your saturation needs. The Overdrive range is wide, from soft textural clipping to heavy distortion.

All voltage controlled inputs have an attenuator-inverter knob.

Features:

Vatrol based 12dB multi-mode Voltage Controlled Filter: Lowpass, Bandpass and Highpass.
Vactrol Based Voltage Controlled Amplifier.
Crossfade between VCF and VCA section.
Voltage controlled Resonance.
Ping Input for percussive sounds generation.
Cutoff Frequency polarity inversion switch. Doesn't change VCA polarity
Overdrive and Feedback controls.
Attenuator/inverter knobs on all voltage controlled inputs
Touch control over Frequency and Amplitude.


Specs:

Width: 10HP
Depth: 33mm
Power consumption: 55mA +12 / 55mA -12
Eurorack Format
Doepfer power connection

Notes: This is an exact hardware replica of the Mutable Instruments Ripples module.

Width: 8hp
12V: 35mA
-12V: 35mA

Notes: ADDAC714 is a dual channel soft clipping module.

Diode based passive clipping acts as a "brick wall" limiter with a fixed knee given by the inherent diode physics. A passive RC low pass circuit adds a 3.3KHz -3db low pass filter which sculpts the overall tone while also adding further character to the effect.

At the top an On/Off [BYPASS] switch routes the signal into the Effect (Up: Active) or to the bottom output gain stage (Down: Bypassed).

The amount of clipping is set by the [GAIN] control, it mostly works as a threshold control for how much clipping will be applied.
As more clipping is applied the signal's amplitude will also decrease, to compensate for this we set up a gain compensation stage to keep the output amplitude balanced across the Gain range.

Symmetry chooses between bipolar clipping or positive clipping, this relates to the harmonics generated, bipolar for odd and even harmonics (up position) and unipolar for odd harmonics only (down position).

At the second stage, an opamp based x2 output gain with a clipping led, which monitors the clipping at the output, and an [Output] control to set the output volume.

Having the top and middle gain stages provides flexibility allowing the user to completely distort the signal on the top stage and tame it's output level with the second stage.

At the bottom, Input jacks for both channels (Left input is normalled into Right input) and output jacks

Tech Specs:
6HP
4 cm deep
40mA +12V
40mA -12V40mA +12V
40mA -12V

Notes: GOBLET is an analogue filter and distortion unit with some added quirks and extra controls.

Why:

To make stuff sound filthy.
To shape the output of an oscillator.
To live interact with the sound during a performance.
To soft sweep the cutoff thanks to the optocouplers logarithmic response.

With:

Simple waves - make them unrecognizable.
Complex waves - shape them into something new.
Percussions - crank the resonance and give an acid twist to a beat.
No input - play with the feedback and the touch controls.

Dimensions:

8 HP
18 mm deep

Current Draw:

45 mA +12V
25 mA -12V

Whichever power connector you use should work fine with the polarity.

Notes: Bleeding Hearts Eurorack Modular Device

(Random Sequencer, Rhythm Generator, Destroyer, and Filter)

The Bleeding Hearts is a device that starves, bit crushes, splatters, and filters audio sources like no other. Feeding a gate signal to the Bleeding Hearts enables a whole new world of strange and random analog-generated movement. Each position of the 8-step sequencer can bleed into each other and interact with the destruction effect, creating gated and filtered splatters, glitches, and crunches that move to the beat of your patch.

Designed and assembled in Seattle, Washington. Includes a limited 1-year warranty, if registered within 30 days of purchase.

20hp, 42mm deep.

Notes: Versatile stereo digital filter based on Endorphin's Grand Terminal module. CV-controlled cutoff, resonance and separate high-pass filter. Simple but effective.

Supplier notes:
The Squawk Dirty To Me is a stereo filter with voltage controlled resonance. It features eight filter modes and zero-delay feedback.

- Simple and effective 6hp stereo VCF
- 8 filter modes available with meta CV scanning, famous zero-delay feedback Grand Terminal filters
- Additional hi-pass filter in series quickly cuts the boomy low end

Notes: The famous MS 20 filter for AE modular!

This adaptation of the filter used first in Korg's MS-20 synth for AE modular offers control knobs for cutoff frequency, resonance and CV attenuator. Two signal inputs for different signal levels control the "drive" of the module. Compared to the wasp filter this filter has a significant self resonance and also a very quick response to changes in the cutoff frequency.

The filter type is switchable between lowpass and highpass (LP/HP switch).

Notes: ***B-STOCK: Box opened, but product is in excellent condition and in perfect working order***


Module A-121s is a dual multimode filter which can be used for stereo applications as well as for parallel or serial organized dual mono filters. The core is a 12dB multimode filter identical to the modules A-121-2 and A-121-3. The selection of the filter type is continuously from lowpass via notch and highpass to bandpass. We attached great importance to the usability of the manual controls and CV inputs for both stereo and dual mono applications. For the filter parameters frequency (F), resonance (Q) and type (T) common controls and CV inputs as well as single controls and CV inputs are available. For the filter frequency in addition a manual control and CV input for the filter spread (frequency difference or delta F) is available.

Controls:
F: master frequency control for both filters (large knob)
Type 1 / Type 2: filter type panning/morphing L-N-H-B
Link to 1: Toggle switch so that Type 1 also controls type of filter 2 (i.e. simultaneous filter type control for both filters)
SFM1 / SFM2: Single Frequency Modulation controls (polarizers), connected to the corresponding sockets SFM1/SFM2 (socket SFM1 is normalled to a fixed positive voltage, SFM2 is normalled to SFM1, that way the controls SFM1/SFM2 work as frequency controls for each filter provided that no modulation signals are patched to the SFM1/SFM2 sockets)
CFM: common frequency control, controls two VC-polarizers which process the signals connected to the two sockets CFM1/CFM2, CFM2 is normalled to CFM1, that way also the same modulation signal (e.g. an envelope generator) can be used for both filters and the level controlled simultaneously by the CFM control
Delta F: controls the difference between the frequencies of the two filters manually (frequency "spread"), at centre position the frequencies are the same
Delta FM: controls the level of the Delta FM signal (socket), which allows to control the spread between the frequencies also by an external control voltage (e.g. by an LFO or ADSR)
Q: controls the resonance of both filters simultaneously
Level 1 / Level 2: attenuators for the two audio inputs
QM/TM1, QM/TM2: attenuators for the modulation inputs QM/TM1 and QM/TM2

Sockets:
In1 / In2: audio inputs (In2 is normalled to In1)
Out1 / Out2: audio outputs
F: common frequency control input for both filters (~ 1V/oct)
Delta FM: Control voltage for frequency spread, processed by the polarizer Delta FM
SFM1 / SFM2: single frequency modulation inputs, processed by the polarizers SFM1 and SFM2, SFM1 is normalled to a fixed positive voltage, SFM2 is normalled to SFM1#
CFM1 / CFM2: common frequency modulation inputs, processed by the two voltage controlled polarizers controlled by CFM knob, CFM2 is normalled to CFM1
QM/TM1, QM/TM2: the addressing of these sockets/attenuators is defined by internal jumpers. QM means Q modulation (i.e. resonance modulation), TM means filter type modulation (QM1 = resonance modulation filter 1, QM2 = resonance modulation filter 2, TM1 = filter type modulation filter 1, TM2 = filter type modulation filter 2), socket QM/TM1 is normalled to a fixed positive voltage, QM/TM2 is normalled to QM/TM1
A 45 degrees triangle next to a socket means that the switching contact of the socket is normalled to a fixed positive voltage (SFM1, QM/TM1).
A vertical triangle indicates the normalling of two sockets (In1>In2, SFM1>SFM2, CFM1>CFM2, QM/TM1>QM/TM2).

If the filters do not behave as expected please pay attention to these peculiarities:

For the controls SFM1, SFM2, CFM, Delta F and Delta FM the centre position is the neutral position as these are polarizers. If the filter behaves unexpected these controls should be set to centre positions for the time being.

For the controls F, Q, Level 1, Level 2, QM/TM1 und QM/TM2 the fully CCW position is the neutral position as these are standard attenuators. If the filter behaves unexpected at least the controls QM/TM1 and QM/TM2 should be set to fully CCW. Via the normalling of the sockets QM/TM1 and QM/TM2 and the associated controls the filter parameters adjusted by the major controls (e.g. Type 1, Type 2 or Q) may be overwritten.

By means of small circles at the bottom right side of the front panel the user can mark the function of the QM/TM inputs. These assignments are possible:
QM/TM1 controls QM1, QM/TM2 controls QM2, the filter types are not controlled by external CVs
QM/TM1 controls TM1, QM/TM2 controls TM2, the resonances are not controlled by external CVs
QM/TM1 controls QM1 and QM2 simultaneously, QM/TM2 controls TM1 and TM2 simultaneously

Notes: Revised take on the excellent Benjolin dual oscillator and filter from Rob Hordijk, featuring the 'rungler' stepped CV generator and extensive output options.

Supplier's Notes:
Benjolin V2 - Rob Hordijk's latest revision of the classic Benjolin. The core of the Benjolin continues to be two oscillators, the rungler (stepped CV generator), and a multimode filter.

This latest revision adds:

Reworked oscillator and filter sections

All levels are adjusted to eurorack standards

Two different steps modes (8/16 and 127)

Double and single clock rate

Externally clockable

External filter input with blend control

Notes: Popple is an 8hp multimode stereo filter based on the Mutable Instruments Ripples V1 filter section. Popple maintains the buttery smoothness of Ripples filter while giving you two separate audio paths. The audio paths share a resonance, control, a frequency cutoff control, resonance CV input, and a v/oct cutoff CV input. Each channel then has it’s own cutoff CV input with attenuverters (which are normalled to a 2.5V signal).

Popple will also self-oscillate at high resonance settings, when coupled with the v/oct CV control, it can also act as a dual sine wave oscillator.

Notes: nRings

This is a new build of a micro version of Rings from Mutable Instruments. MicroRings, also called NanoRings, retains all the same functionality as a full-size Rings module.

The module is fully assembled, tested, and calibrated. Eurorack power cable is included.

These modules use tall bushing potentiometers to offer a more stable feel.