Search dance music

Notes: Discrete VCOs with three Subs, SYNC, Wavefolder, discrete VCA and VCF, Dual analog LFO (one also usable as VCO) into audio rate with Keytracking, huge Mixer section, Ring mod, Glide and Patchfield.

Power consumption: TBA

Rackspace: 36HP

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: 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: 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: 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: 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: Roucha Legio is a 12 dB /octave state-variable stereo multimode filter available on the Legio DSP+oscillator platform.

Noise Engineering received tons of requests for NE filters over the years, and Roucha Legio is their first dedicated release. The filter features lowpass, bandpass, and highpass settings and tracks frequency via the dedicated encoder and extremely accurate 1v/8va CV input. Roucha Legio's CV-controlled resonance parameter can go from clean to acidy-squelchy for bassline joy. Add CV for filter sweeps that will knock your socks off. Of course, because it's a Noise Engineering module, there's a Fold knob. Add wavefolding to the signal chain before, after, or both before and after the filter.

Noise Engineering have made it easy to carry out dramatic buildups and cuts with Roucha Legio. Just tap the encoder to bypass; tap again to turn the filter on again. Want to automate it? Send a gate into the Bypass input. The filter will remain bypassed as long as a high gate is present.

Roucha Legio is also a DSP and oscillator platform: users can change the firmware on any Legio module, 100% free, to any other firmware in the Legio series.

Dimensions
6 HP
38 mm deep

Current Draw
140 mA +12V
22 mA -12V

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.

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: 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: Erica Synths Black Dual VCF is a dual multimode filter with CV control over cutoff and resonance for serious modular patches.

At the core of this VCF is a highly stable, custom multimode VCF chip AS3320 (produced in Riga, btw). This module can be used as two independent VCFs with simultaneous HP, BP and LP outputs, controls can be linked to stereo application and both VCFs can be chained in series or parallel to the summing output for ultimate modulations. Bonus feature - the 16 band spectrum analyser gives you visual feedback on what happens on summing output.

Technical specifications:

Audio output amplitude: 10 Vptp
CV input (full sweep): 10 Vptp
Panel width: 18HP
Module depth: 35mm
Power consumption: 40mA@+12V, 36mA@-12V

Notes: Module A-196 contains a so-called phase locked loop (PLL). The basic PLL system is shown in the sketch at the bottom of this page. A PLL consists of three parts: voltage-controlled oscillator (VCO), phase comparator (PC), and low-pass filter (LPF). All parts are normally connected to form a closed-loop frequency-feedback system.

This is how a PLL works: The output of the internal VCO (linear CV control, rectangle output) is compared with an external signal (e.g. the rectangle output of a A-110 VCO) in the so-called phase comparator (PC). The output of the phase comparator is a digital signal (low/high/tristate) that indicates if the frequency resp. phase difference of the two input signals is negative, zero or positive. The output of the phase comparator is processed by a low pass filter (LPF) to generate a smooth voltage that is used to control the frequency of the internal VCO. The 3 units VCO, PC and LPF form a feedback loop that works like this: The control voltage (output of the LPF) increases as long as the external frequency is higher than the frequency of the internal VCO und stops increasing when both frequencies become identical. The control voltage decreases as long as the external frequency is lower than the frequency of the internal VCO und stops decreasing when both frequencies become identical.

But there are some stumbling blocks: Different types of phase comparators with advantages and disadvantages can be made. Some phase comparators e.g. even lock at harmonics, i.e. if the two frequencies to be compared are integer multiples. But for some applications this can be used to create interesting effects. The A-196 contains 3 different types of phase comparators: PC1 is a simple exclusive OR, that even locks at harmonics. PC2 is a so-called RS flipflop and PC3 a more complex digital memory network. The user can select one of the three phase comparators with a 3-position switch. When PC2 is used a LED displays the "locked" state, i.e. when the frequency of the internal VCO is identical to the external frequency.

Special attention has to be directed to the frequency of the LPF. To obtain a smooth control voltage for the VCO the frequency of the LPF has to be much smaller than the lowest frequency of the internal or external audio signal. Otherwise the frequency of the internal VCO will jitter or wobble around the correct frequency. But for special effects this frequency jitter can be used intentionally. Example: frequencies in the range 50Hz...1kHz have to be processed with the PLL. Therefore the frequency of the LPF has to be about 10Hz or even less. Such a low frequency of the LPF causes a noticeable slew of the internal VCO. When the frequency of the external signal jumps e.g. between 500Hz and 1kHz it takes about 0.1 second until the internal VCO reaches the new frequency (like portamento). So one has to find a compromise between frequency jitter and portamento. But these remarks are valid only for the "ideal" working PLL. As the A-196 is used in a musical environment the "problems" and disadvantages with jitter and slew time lead to additional musical applications like portamento effects, wobbling frequencies or harmonic locking according to the type of frequency comparator and time constant of the PLL low pass filter. Instead of the internal manually controlled low pass filter the voltage controlled slew limiter A-171 can be used to obtain voltage control of this parameter. Normal audio filters (e.g. A-120, A-121) cannot be used for this job as the minimum frequency is to high (down to a few Hz or even less necessary) and the signal has to be DC coupled due to the low frequencies. Audio filters are normally AC coupled.

Another very important application of a PLL is frequency multiplication in combination with an external frequency divider. For this the output of the PLL-VCO is processed through an external frequency divider (e.g. A-163, A-160, A-161, A-115) before it is fed to In1 of the phase comparator. In this case the frequency of the PLL-VCO will be a multiple of the master frequency. E.g. if the A-163 is used and adjusted to dividing factor 5 the frequency of the PLL-VCO will be 5 times the frequency of the master VCO. Consequently, frequency division (A-163) leads to frequency multiplication with the PLL circuit. In combination with the PLL low pass frequency several effects can be realized (frequency multiplication with portamento or wobbling). The frequency multiplication can even be used to drive a graphic VCO. If your graphic VCO e.g. has 8 steps (e.g. A-155) and you use a frequency divider with factor 8 in the PLL feedback the output of the graphic VCO has the same frequency as the master VCO. Another application is the generation of pseudo-harmonics (not real harmonics as only rectangle waves are available) or clock generation for switched-capacitor filters.

Notes: Belgian analogue innovators Joranalogue serve up an ultra-versatile filter module. Multimode flexibility meets self-oscillation for added sonic versatility. A hell of a lot of filter for the money.

Supplier's notes:
Representing the cutting edge in modular analogue voltage controlled filter (VCF) design, Filter 8 offers more possibilities and higher fidelity in 12 HP than ever before.

Starting from the classic OTA-style 4-pole cascaded lowpass (LP) topology, Filter 8 features separate LP outputs, each with their own character. Additional filter responses are achieved by pole mixing: 1-pole highpass, a special band boost and notch response, phase shifter and 4-pole bandpass. All outputs are available simultaneously.

Key to Filter 8's performance is the innovative resonant feedback circuit. By increasing the resonance, all outputs will resonate at the filter frequency, without any low frequency response loss. At higher resonance levels, self-oscillation is achieved, turning the module into an excellent 8-phase sine wave voltage controlled oscillator (VCO) with temperature and switchable gain compensation, low distortion, constant amplitude and accurate frequency tracking over at least 5 octaves. At sub-audio frequencies, Filter 8 can function as an 8-output voltage controlled slew modifier or 8-phase low frequency oscillator (LFO).

Simultaneous exponential and linear frequency modulation is possible, for classic FM tones or chaotic modulation. A hold feature is also provided, 'freezing' the output voltages manually or under gate control. This is useful for halting modulations, or as a sync-like effect at audio frequencies. The dedicated 'ping' input allows you to easily create crisp percussive sounds with different timbres.

While rooted in the legacy of classic synthesisers, Filter 8 provides a new approach to musical signal generators and modifiers: instead of simply a VCF, VCO, slew modifier or VCLFO, a single analogue module can now be any of those, and anything in between.

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: A 22hp version of Mutable Instruments Elements. It is functionally equivalent and therefore runs all firmware options and having identical sound characteristics. This version is great compromise between the tight spacing of Atom and full size original, which is a bit large.

Width: 22hp
12V: 130mA
-12V: 10mA

Module power connector can be connected either way on the module side.

Notes: Welcome to the Forbidden Planet, an all analogue multi-mode filter design influenced by the 1975 Steiner-Parker Synthacon model. Control the Forbidden Planet manually or through CV and take the sound of your Eurorack into new orbits.

Forbidden Planet has three filter input jacks: High Pass, Low Pass and Band Pass. The High Pass section is this module's signature sound - a crisp sharp-cut with no residue, designed to add High Pass filtering capability to Tiptop Audio's wide range of Eurorack modules. Send a throbbing kick drum through the High Pass section and filter out the rumbling lows while maintaining the pulse of the beat. The Bandpass is clear and useful in isolating a pie-slice-range-of-frequencies while cutting off the low and highs, great for accurate sound design or sculpting audio into that sweet spot. The Low Pass is an airy classic 12db two-pole analogue slope ideal for monophonic synth patches and filtering down to the essential low-end bass we all love.

The Forbidden Planet Resonance utilizes an internal feedback path which can sound smooth or aggressive depending on the knob setting. At a low setting, it emphasizes the cut-off harmonics, at middle settings it begins to self-oscillate, and towards maximum setting it forms interesting tones and all sorts of chopped grainy bits of self-oscillation perfect for entering into a sci-fi world.

The Forbidden Planet is an impressive multi-mode analogue filter which adds a broader filter spectrum to the Tiptop Audio modular family and unlocks forbidden creative possibilities in a small package.

Notes: Add external feedback loops, tilt filters and more to the Timiszoara effects module with this versatile expander. A must-have for Timiszoara owners.

Supplier's Notes:
Deva is an expander for Xaoc Devices' Timiszoara multi-fx module designed for creative exploration of the dirty/nasty side of signal processing. Deva opens up the Timiszoara programs you've come to love with some unexpected twists and turns along the way. The analog side features two external feedback loops (for the left and right channel) with tilt filters adjustable via sliders with two additional switches for choosing positive or negative feedback (for each channel). The third slider controls the DAC clock - from overclocking by a factor of two down to 16-times slower, so you can go from chipmunk to hardcore teeth gnashing of underclocked goodness. A switch allows for turning the clock control off for normal/regular operation. All features have inputs for external CV.

Technical details

Eurorack synth compatible
8hp, skiff friendly
Power drawn from Timiszoara: +60mA/ -50mA
Reverse power protection

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: 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: 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: Roucha Legio is a 12 dB /octave state-variable stereo multimode filter available on the Legio DSP+oscillator platform.

Noise Engineering received tons of requests for NE filters over the years, and Roucha Legio is their first dedicated release. The filter features lowpass, bandpass, and highpass settings and tracks frequency via the dedicated encoder and extremely accurate 1v/8va CV input. Roucha Legio's CV-controlled resonance parameter can go from clean to acidy-squelchy for bassline joy. Add CV for filter sweeps that will knock your socks off. Of course, because it's a Noise Engineering module, there's a Fold knob. Add wavefolding to the signal chain before, after, or both before and after the filter.

Noise Engineering have made it easy to carry out dramatic buildups and cuts with Roucha Legio. Just tap the encoder to bypass; tap again to turn the filter on again. Want to automate it? Send a gate into the Bypass input. The filter will remain bypassed as long as a high gate is present.

Roucha Legio is also a DSP and oscillator platform: users can change the firmware on any Legio module, 100% free, to any other firmware in the Legio series.

Dimensions
6 HP
38 mm deep

Current Draw
140 mA +12V
22 mA -12V

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: Erica Synths Black LPG is our take on Lowpass Gate idea - it's designed from scratch
module featuring 2nd order lowpass VCF (the original Buchla lowpass gate was 1st order
VCF) and VCA combo with distinct resonance circuit on top. Voltage control over VCF cuto
frequency/VCA oset and mode (VCF/VCF+VCA/VCA), as well as built in decay envelope
generator makes it a versatile module for sound shaping in any modular setup.

FEATURES:
Three vactors for 2nd order VCF
VCF/VCF+VCA/VCA modes
Manual and voltage controlled cuto/oset
Manually and voltage controlled mode selection
Manually resonance depth control
Resonance overdrive switch
Built in decay envelope generator
Manually and voltage controlled decay time
Envelope CV output
Ski-friendly design

SPECS:
Audio output amplitude 10Vptp
CV range (full span) -5V - +5V
Max Decay time 4''
Panel width 10HP
Module depth 35mm
Power consumption 44mA@+12V, 45mA@-12V

Notes: The Dystopia is ideal for complex patches where sound can be used to thicken the sound or filter out frequencies. It features a noise generator which can provide white, white to pink, white to blue, scatter, digital, pitch types of noise. The digital noise is brilliant as it can be used as a random gate generator. The bit crusher stage can range from one second up to 8kHz - meaning you can obtain really thick distortions - ideal for a range of styles of music. You can reference all the signals through the four LEDs too - which help you determine the level at which the module is pumping out the noise sources.

Noise Generator (white, white to pink, white to blue, scatter, digital, pitch)
Bit Crusher with range from 1sec up to 8kHz
Digital Noise can also be used as a Random Gate Generator
Dual Filter (parallel) 12dB Low Pass and High Pass Filter
When you insert a signal to the External In, the Internal Noise generator is cancelled and the External Signal is in process
LED indicator for all controls to illustrate the current CV Sum

56 mA +12V
67 mA -12V
35 mm deep
10HP

Notes: The Beautifier is a flexible OTA based filter, featuring a lowpass/bandpass switch and a selectable slope of 24db and 12dB. Two attenuated CV inputs for frequency cut-off and resonance. The filter self-oscillates at a given point and can be driven quite hard if you crank up the gain. All in all, a versatile analogue workhorse with a lot of character; from smooth and creamy to quite raw and screamy.

47 mA +12V
19 mA -12V
0 mA 5V
26 mm deep

Notes: Three-band isolator with stereo inputs and outputs, splitting the signal into highs, mids and lows then allowing you to control level and frequency via CV for some clever sound sculpting and modulation.

Supplier's Notes:
Katowice is a stereo variable-band isolator that allows the user to manipulate a selected range of frequencies. It is the first module in a series of upcoming Xaoc Devices products designed specifically for processing stereo signals.

Katowice splits the stereo input signal into three bands: low, middle, and high. While the knobs and CV inputs define the center frequency and bandwidth of the mid band, the low and high bands are automatically adjusted so that the sum of all three is a complete signal. All three bands are passed through high quality VCAs and their stereo outputs are available separately for further processing. A stereo mixdown signal is also available.

Katowice may be used as a crossover network, a parametric EQ, DJ-style kill filter, or other band-selective applications, including multiband compression and stereo enhancement.

TECHNICAL DETAILS:
Eurorack synth compatible
10hp, skiff friendly
Current draw: +100mA / -100mA
Reverse power protection

Notes: 6HP Micromodule of Opensource Rings

Notes: The Neutron Flux 8 Pole Variable Character Filter is a 12hp skiff friendly eurorack filter module with a stereo analog core and digital control over it. The controls are familiar filter module controls (cutoff, bipolar FM, mode, drive) with some added spice and no complexity.

The special stuff is in these controllable features:

Character: This control blends between five vintage influenced classic filter characters: Fat, Crisp, Liquid, Sour and Mean. Coming later in a firmware update, the Neutron Flux will also have two user banks for more specialized filter characters which can be replaced via audio update.

Overdrive: You can switch the drive circuit to have a +20dB boost and have the drive pot to sweep from clean via warm saturation to extremely hard distortion.

Stereo: This control spreads the cutoff between L and R channels and induces drift. This way a mono signal can be split into wide stereo.

Two 4 pole filter cores: These can be run in stereo, mono to stereo or chained as a 8 pole mono filter for almost LPG-like steep slope. Both of them have their own drive circuits so you can have the overdrive stage in the front, in between or both.

The module can be used in many different ways. It can do classic LP/HP/BP filtering. It can self-oscillate in different waveforms. It can provide analog warmth and process something coming out of your DAW. It can act as a stereo distortion. It can spread your mono signal to a wide spatial stereo soundscape. It can do formant stuff and other wild characters. It can do audio-rate deep FM (1V/oct and FM CV's are all analog).

Power consumption: 250mA at +12 V and 100mA at -12 V
Depth: 25mm
HP: 12

Notes: This 30HP wide module features twelve fixed frequency, inductor based bandpass filters, set at half octave interval spacing and covering from 125 Hz through to 5.8kHz. It also features low pass and high pass shelf filters, again they are fixed frequency and both are active inductor based circuits. It has a vintage pedigree that harks back to the original and highly sought after 914 Fixed Filter bank from the 1960's Moog 900 series modular synthesiser system, however we have brought this design up to date and made it compact enough to fit into skiff friendly Eurorack cases by using gyrator based active inductors, and have added some other very useful features too - the bands are split alternatively to left and right channels, each having their own individual output, and there is also an inbuilt Voltage Controlled cross-fader that allows panning between the left and right banks, with a mix of all bands available in the central position.

In addition, we have a second cross fader that can mix between the dry incoming signal, or an external signal fed into input 2, and this is cross-faded against the wet MIX Output - this allows Voltage Controlled crossfading from wet to dry signals, or between wet and external signals - and the level of each can be adjusted using the Input 1 and Input 2 level controls.

A further addition is the feedback control, this is similar in design to the resonance control on a regular VCF, but because of the multiple fixed filters topology it is rather different in operation - it would normally be added in small amounts to thicken up the sound, however we have allowed the feedback to traverse to quite extreme settings for howling feedback and even soft clipped self-oscillation, especially for the noise merchants out there...

Using L/C inductor topology bandpass circuits rather than the usual Sallen Key R/C active bandpass filters does give a slightly different sound and this is part of the magic of the original 914 filterbank, as the LC based circuit exhibits less phase shift against frequency that the more common Sallen Key R/C based bandpass filters that are used in many Modular synths.

Many people often wrongly assume that a fixed filter bank is exactly the same as a graphic equaliser - however this is certainly not the case, if all of the controls of a graphic EQ are set to centre then a flat frequency response is expected and the output will sound very similar, or identical to the input - this does not happen with a fixed filter bank, the frequency response rises and falls as it passes between each stage (but to a lesser extent than if the filters are all set to maximum output), so it acts as a soft slope comb filter, and the resulting output sounds very different from the input signal. Also, with all of the individual filters turned to zero there will be no output at all.

Notes: The ADDAC603 VC Triple Bandpass Filter provides three channels of bandpass filters, fantastic for sculpting complex sounds. Each of the channels feature a gain/distortion control with switch to select between x3 or x100 gain, which can cause the input signals to distort, adding another layer of harmonic interest.

The inputs are cascaded together to allow for one source to be filtered three different ways - or each filter can be used independently. The three filters also feature controls for frequency, which sets the cutoff point; width, which sets the width of the band that is being filtered; feedback, which at high settings causes the filter to self-oscillate, and level control, which sets the amplitude of the output. Frequency, bandwidth, and output level each have CV inputs with attenuverters.

A switch sets whether the filter is 24 dB or 12dB per octave. There are individual outputs with phase switch, plus a mix output and dry/wet output with adjustable control for mix balance. This module provides a wide variety of filtering options to add complex tonal shaping to your rack.

Tech Specs:

22HP
3.5 cm deep
250mA +12V
250mA -12V

Notes: Genuine EMS synthi filter, with redesigned faceplate!

This legendary filter can be switched between pre1974 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 module is made under license from EMS. The only officially licensed remake of the EMS diode lowpass filter used in the VCS3 and AKS synths. It´s a faithful recreation of the original circuit, featuring some modifications that are also done on vintage EMS equipment, like a switchable faster CV response option for very quick modulations. Another switch determines if the filter has 18dB/oct slope as used by EMS pre-1974 or 24dB. The cutoff frequency and also the resonance are voltage controllable. Signal inputs and outputs have level controls.

Notes: Lovely little mono filter module in a compact desktop format. Based on the classic Prophet 5 filter, ideal for processing synths and signals, hooking up to Eurorack or other Hungry Robot modules.

Supplier's Notes:

The Hungry Robot VCF is an all analog, 4-pole low pass filter with a self-oscillating resonance control. It is a close replication of the filter circuit found on the famous Prophet 5. It uses a HM2040 which is a high quality, faithful replication of the original SSM2040 chip. This resonant filter has a beautiful tonal quality. The over-sized knobs provide a satisfying tactile response. The cutoff frequency can be controlled by external control voltage. It has a built-in attenuator and invert switch for the incoming CV. CV input does not track at 1V/Oct, but is scaled to act as a VCA when a 5V signal is applied to CV input. As with all Hungry Robot "Modular Boxes" the VCF can be powered by a simple 9V DC, Negative Center power supply.

KNOBS
-FREQUENCY: Sweeps the cutoff frequency of the filter.
-CV: Attenuator for incoming CV input.
-RESONANCE: Sets resonance of filter. Small volume drop is to be expected. Will self-oscillate at higher settings.

SWITCHES
-INVERT: Inverts the incoming CV input. Toggle to the right to invert incoming CV

PATCH POINTS
-IN: Patch Audio Signal In
-CV: CV input for Frequency. Allows for CV control of this parameter.
-OUT: Patch Audio Signal Out

Dimensions: 4.7" x 2.6" x 1.5"
Power: 9V DC - Negative Center - 2.1mm Barrel

Notes: Tone is a quad, voltage controlled filter with low pass and band pass outputs. Its four channel architecture enables the intuitive patching of shimmering, polyphonic textures. The 24dB slope provides a warm, buttery character. Self oscillation allows each channel to double as a sine wave oscillator with v/oct tracking across four octaves. Cascade OTA topology. A perfect match for the Chord.

Notes: The Ar Merc'het Brao module is comprised of two filters and two overdrives.

As usual at Touellskouarn it has a Breton name: Ar Merc'het Brao means "The pretty girls".

It can be used with a stereo signal or with two mono signals. The module is modular as well as guitar friendly.

The filters are resonant with a slope of -12dB. A switch allows to switch each filter from LowPass to HighPass. The filter cut-offs are voltage controlled thanks to dedicated CV inputs. Additionally, the Ar Merc'het Brao features global controls for cut-off and resonance.

Both overdrive sections offer the classic and well known TouellSkouarn distortion sound.

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 FUMANA is an all analog dual filter bank with various control to access dynamically these bands. Each filter bank is composed of an array of 16 independent 48dB/oct bandpass filters. Having two identical filter arrays, allows you to use one of those for spectral analysis (of a modulator signal) and the other for spectral re-synthesis (of the main signal). Each array is sub-grouped in odd and even bands (numbering these increasingly from 1 to 16 from left to right). It is possible to apply different signal to odd and even bands, both for main and/or modulator arrays. This, together with the 16 envelope followers connected to each band of the modulator filterbank, and the 16 VCA connected to each band of the main filterbank, allows the FUMANA to perform a single 16 bands or a dual 8 bands analog spectral transfer.

While the upper section provide access to each main filter's direct output, the lower section has 4 voltage controllable parameters to manage two independent functions for further spectral editing: tilt and parametric scan.

The tilt, as the name suggest, tilts the spectrum, adding and subtracting amplitude to the 16 bands, emphasizing lower or high bands, and attenuating high or lower bands: this is managed only with the green potentiometer.

The parametric scan, instead, works with three parameters: peak/notch, band selector and width. Like in a parametric equalizer, where is possible to set peak/notch gain, frequency and slope, the FUMANA uses three parameters to set which is the centre band to perform this manipulation, then if that band should be emphasized or attenuated, and how this action is extended to nearby bands.

In addition to the 16 bandpass outputs, there are other 4 outputs provided: the all bands output, the all envelope followers output, the odd bands and the even bands output. These two have the options to be inverted in phase with two switches, in order to obtain even more combination when summed together, maybe/also with the "all bands output", using, for example the 333 module.

Since a spectral transfer tool may be used as a "vocoder-like-effect", the FUMANA provides an input for an external noise which may be used for unvoiced (fricative/sibilants) sounds as words containing or starting with s, f, z, ch and other fricative sounds.

Notes: Studio Electronics' version of the boxy, Blade Runner-sweet and Boomstar-brash dual mode CS80 filter, initially married to the Omega Series Synths, and then tucked-in the 'Stars, now joins the Modstar Collective. They've twisted and turned the SE88 to unflatten the earth, so to speak; the original CS80 fed a HP filter into a LP filter, but with the SE88 your can select MODE 1's HP or BR to feed MODE 2's LP or BP, or patch it to reverse that pleasant path. The audio signal is completely controllable with input and output levels for each filter. Cherish and respect your filter's input gain stages, for a smooth yet often brassy sound - shed your mercy to strike hard for boiling, snarling bite, even to the blackout/cutout point (see Greg St. Regis, Tim Caswell, and Marc St. Regis' SEM filter commentary for a detailed diatribe on this "feature too far"); then and only then, uniquely blend mode settings for the filter family values you revere.

To get things merrily modulating, each filter employs attenuverters for frequency and resonance experimentation and decimation. While the SE88 does not self oscillate (Yamaha's creation didn't either), we did amp up the resonance level for full-throttle squelching. An additional master FM (frequency modulation) attenuverter-controlled level can feed both filters (when hungry enough) simultaneously, and tracking switches allow for individual keyboard response for each of the contrasting and complimentary filter modes.

Potentiometer Potential:
Five attenuverter and eight attenuation pots control the FREQUENCY MODE 1, FM IN, FREQUENCY MODE 2, RESONANCE, M1 FM, RESONANCE, M1 RES CV 1, M2 RES CV, INPUT, M2 FM, OUTPUT, LEVEL (M1 OUT), and LEVEL (M2 OUT).

Switch it Up:
2/3 - 1/3 TRACK (M1), FULL - HALF TRACK (M2), HP - BR, LP - BP.

Patch it Up:
Ten patch points: 1 V/O, FM IN, M1 FM, M2 FM, M1 RES CV, M2 RES CV, M1 IN, M1 OUT,
M2 IN, M2 OUT.

All Controls and Patch Points:
FREQUENCY MODE 1 - Adjusts the frequency, or cutoff of Mode 1.
2/3 - 1/3 TRACK - Toggles tracking options for Mode 1.
FM IN - Adjusts the master frequency modulation input.
FULL - HALF TRACK - Toggles tracking options for Mode 2.
FREQUENCY MODE 2 - Adjusts the frequency, or cutoff of Mode 2.
RESONANCE - Adjusts the resonance of Mode 1's filter.
M1 FM - Adjusts Mode 1's frequency modulation.
RESONANCE - Adjusts the resonance of the Mode 2's filter.
HP / BR - Toggles the High-Pass and Band-Reject option.
M1 RES CV - Adjusts Mode 1's resonance control voltage.
M2 RES CV - Adjusts Mode 2's resonance control voltage.
INPUT - Adjusts the master audio input.
M2 FM - Adjusts Mode 2's frequency modulation.
OUTPUT - Adjust the audio output.
1 V/O - One volt per octave control voltage input.
FM IN - Master frequency modulation input.
M1 FM - Mode 1 frequency modulation input.
M2 FM - Mode 2 frequency modulation input.
M1 RES CV - Mode 1 resonance control voltage input.
M2 RES CV - Mode 2 resonance control voltage input.
M1 IN - Mode 1 input.
LEVEL - Level control for Mode 1.
M1 OUT - Mode 1 output.
M2 IN - Mode 2 input.
LEVEL - Level control for Mode 2.
M2 OUT - Mode 2 output.

- Size: 20hp
- Depth: 39.7mm with ribbon cable attached
- Power Usage: 42mA (+12 / -12)

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: 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: 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: 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.