Synth modules

Notes: The SetonixSynth/Tidbit Audio Psychedelic Voltage Processor, or PVP, is a four-channel chaos module. It uses colour-changing LEDs to produce fluctuating voltages in response to the Channel input, with each channel normalized in series to create increasingly chaotic "taps" that can be used one after another for different variations.

Any positive voltage input such as unipolar LFOs, envelopes, stepped voltages, or simply the onboard normalized voltage patched to a channel input is reproduced approximately on each channel output, with the PVP inducing unpredictable fluctuations due to the variable current consumed by an LED circuit with a mind of its own.

Dimensions
8 HP
25 mm deep

Current Draw
135 mA +12V
10 mA -12V
0 mA 5V

Notes: Module A-188-9 is a so-called high speed VCO that tracks perfectly to the 1V/oct scale in the frequency range of about 15kHz ... 500 kHz. The main application is the exact drive of BBD modules (A-188-1/2) to generate sounds realized by means of the so-called Karplus-Strong synthesis. But even in cooperation with other modules featuring high speed inputs (e.g. digital noise, delay, frequency divider) the A-188-9 makes sense. In principle the module is made of a precision audio VCO followed by a PLL (phase locked loop) unit that multiplies the frequency of the audio VCO by 32. Thus the module can be used also as an audio VCO as it features the standard waveforms sawtooth, triangle and rectangle with adjustable pulse width.

Controls:
Frq: frequency control (coarse)
CV: attenuator for the frequency control input CV
Fine: frequency control (fine), small control without knob
PW: pulsewidth control for the rectangle output of the audio VCO, in HSVCO mode this control has to be in the range marked "HSVO", small control without knob

Sockets:
1V: frequency control input 1V/oct scale
CV: frequency control input with attenuator CV
socket with rectangle symbol: rectangle output of the audio VCO, the pulse width of this output is adjusted by means of the control PW, output level ~ 7Vpp (~ -3.5V/+3.5V)
socket with sawtooth symbol: sawtooth output of the audio VCO, output level ~ 7Vpp (~ -3.5V ... +3.5V)
socket with triangle symbol: triangle output of the audio VCO, output level ~ 7Vpp (~ -3.5V ... +3.5V)
socket with inverted comb symbol: high speed VCO output, waveform rectangle, output level ~ 5Vpp (~ -2.5V/+2.5V)

Switches:
Range
upper position: audio VCO mode (frequency range of the audio VCO about 15 Hz to 6 kHz, the high speed output is not usable in this mode! )
lower position: High Speed VCO mode (frequency range of the high-speed output about 15 kHz ... 500 kHz, frequency range of the audio VCO about 500 Hz ... 15 kHz), in this mode the audio VCO and the high speed VCO can be used simultaneously

Slew
upper position: medium slew time
centre position: short slew time
lower position: long slew time
Technical Note regarding the Slew parameter:

Besides the audio VCO the module contains a so-called PLL circuit (Phase Locked Loop) and a 1:32 frequency divider. A slew limiter is part of the PLL. It defines how fast the frequency of the PLL follows the frequency of the VCO. The PLL cannot follow the VCO without any delay. Rather one has to find a compromise between the residual ripple of the PLL frequency and the frequency follow rate. That is the job of the slew limiter (works in principle like a glide or portamento unit). For this the module is equipped with a 3-position switch that is used to switch the slew time in 3 ranges. When mostly higher frequencies are used ((~ 100kHz ... 500 kHz) a short slew time can be chosen. When also lower frequencies are required (< 100kHz) a longer slew time may be used to reduce the residual frequency ripple. More details about the working principle of a PLL can be found in the information about module A-196. Module A-188-9 is in principle an A-196 combined with an audio VCO and a 1:32 frequency divider.

Width: 4HP / 20.0 mm
Depth: 45 mm (measured from the rear side of the front panel)
Current: +30 mA (+12V) / -15 mA (-12V)

Notes: Add-on for the Krait module.

Ewa was created as a lovely partner for the Krait module, a syncable 3-channel modulation source. Paired with Ewa, Krait will get new useful abilities, such as 3 freely routable cv inputs, endless encoder for smooth editing without value jumps, dedicated clock menu button and clock and reset outputs.

Each CV input can be used to record external cv source in Record mode. Beside that you can route any input to any parameter of the LFO and Random too. With Ewa now it is easy to modulate LFO rate or Random slew for example. CV inputs are bipolar and react to the signals between -5 +5 voltages.

Additionally a dedicated clock menu button and clock output can make Krait as a clock source for other modules in your system that need sync.

Technical details

4 hp

20 mA +12V

12mA -12V

0 mA 5V

42 mm deep

CV input voltage ranges: +5-5v, 0v+5v

To use Ewa, you need to install firmware 2.0 on Krait.

Notes: The SetonixSynth Marsupial is a new dual filter design based around the re-issued AS3350 filter IC, originally used in rare synths such as the Synton Syrinx, Crumar Spirit and Rhodes Chroma but never widely utilized. Normalization between the control inputs and a Series/Parallel switch makes it simple to dial in a huge variety of unique and musical filter sounds.

Current draw: 36mA @ +12V; 35mA @ -12V

Eurorack width/depth: 8hp; 25mm

Notes: Capture the iconic sound of tape sliding to a halt with Tape Stop, a clock syncable tape stop module that puts this classic effect at your fingertips. Originally an accidental artifact of analog tape, this effect has become a beloved tool in music genres from hip-hop to IDM. Now, it's fully controllable in your modular system.

Adjust the Lag to set the stop length, then tap Trig to activate. Hit it again to resume your audio seamlessly. With clock sync, your stops and starts stay perfectly in time, and a toggle lets you switch between momentary and latching Trig modes. Add a touch of tape magic to your modular system with Tape Stop!

Notes: Capture the iconic sound of tape sliding to a halt with Tape Stop, a clock syncable tape stop module that puts this classic effect at your fingertips. Originally an accidental artifact of analog tape, this effect has become a beloved tool in music genres from hip-hop to IDM. Now, it's fully controllable in your modular system.

Adjust the Lag to set the stop length, then tap Trig to activate. Hit it again to resume your audio seamlessly. With clock sync, your stops and starts stay perfectly in time, and a toggle lets you switch between momentary and latching Trig modes. Add a touch of tape magic to your modular system with Tape Stop!

Notes: ***B-STOCK: Without original box, old panel design, shows some signs of wear***


Introducing the HATS909, part of our new series of drum modules that brings those classic percussion sounds into the modular synth world, instantly turning your system into a self-contained music machine.

The HATS909 is the TR-909's original Closed and Open Hi-Hats circuits adapted for use in Eurorack modular synthesizer format and was tested to sound like a machine coming fresh off the assembly line back in the 80's Improving on the original, we have added some great new features that expand the sound palette of hats that can be produced with this small, powerful module.

The original TR-909 circuit is made with a combination of low-fi 6-bit sound samples that pass through a series of analog elements to provide envelope and filtering to the source sound. The HATS909 module allows for manual and voltage control of the sample's tuning, which provides anything from crushed hats and short ticks to the original sound and anything in between. A modulation switch allows you to tap a voltage control to either the tune input or the internal VCA for modulation with external control signals or for adding AM or FM synthesis in the audio range from external oscillators, other drum sounds, or just about any sound source. HATS909 also offers a switch for a direct tap to the output of the original sample, bypassing all other internal analog processing, giving you the pure source sound for synthesis any way you want with your own modules.

Just like the other drums in this series, the HATS909 high-powered output gain stage allows you to further harmonize the sound through distortion and clipping. On each gate input, we have designed a dual pulse-shaper circuit so you can trigger your HATS909 with trigger/gate signals from step sequencers, clock dividers, or any other pulse/clock sources.

Notes: Motion Pictures

(Delay And Reverb)

Motion Pictures combines lush delay and reverb with intuitive, powerful controls within a 10HP module. Choose between a crisp digital delay or a warm analogue delay and pair it with a spacious, large-hall stereo reverb. Delay and reverb levels can be adjusted independently, allowing you to use them separately or together. The delay time can be controlled using a knob, tap tempo, or CV. You can even send opposing CV signals to the tap tempo and delay time for glitchy, pitch-bending, rhythmic effects. Additionally, CV control extends to the feedback, delay, and reverb levels, providing greater flexibility. Motion Pictures offers rich ambient sounds in a compact design, combining delay and reverb in one module to optimize rack space while preserving sonic depth.

Notes: Introducing the Cortisol Legend: a spiritual successor to one of my early designs, the Steroid Legend, it presents as 4hp of white hot saturation and hairy distortion, and features manual control over two op-amp driven gain stages, with a diode saturation control in the middle, giving you precise control over distortion ranging from smoldering saturation all the way into utter rail-to-rail fuzzification.

As for the diodes, the Cortisol Legend has two flavors on tap: Steroid Legend-inspired diodes and genuine, Cold War-era USSR-made Germanium diodes from the far reaches of Europe. These diodes are getting increasingly hard to find, but have been known for their warm and fuzzy characteristics by guitar pedal enthusiasts for years. Here, you get the genuine article, for as long as they can be reliably sourced.

In addition to having control over the saturation depth, the Cortisol Legend offers an additional control parameter: Eustress and Distress. Roll off the edge and noise a bit with a Styroflex-capacitor filter which varies with saturation depth, or leave no edge unjagged with this setting.

Speaking of noise, this thing is LOUD, so you may want to have an attenuator such as the psATT on hand, unless of course the loudness is exactly what you want. Hand in hand with the overdrive and distortion comes, of course, beautiful new harmonics added to anything from single waveforms to samples, sounds and entire mixes.

Various diodes will be available at different times, but all variants are ultimately limited - all Germanium diodes used in these are new old stock from the Cold War, and one day they will run out.. Expect individual modules to have a bit of their own character.

Notes: Great value from Xaoc's pingable dual VCA, capable of creating organic, acoustic-style decay curves which replicate the dynamics of real-life instruments. Ideal for processing audio as well as CV.

Supplier's Notes:
Xaoc Devices Lublin is a high-quality dual VCA module with exponential CV inputs. On top of that, its two identical channels feature additional inputs for pinging. These inputs use an elaborate analogue circuit to model the dynamic behaviour of vactrols, allowing you to trigger a carefully crafted gain response that mimics the natural decay of plucked and struck acoustic instruments. Unlike lowpass gate modules though, Lublin reduces gain while retaining the full frequency bandwidth, so it is perfect for harmonically rich signals, like our Odessa additive VCO. The vactrol-like behaviour is just a starting point as the envelope may be varied within a wide range using a switch (natural, shortened and prolonged response) and a potentiometer, so you are not stuck with one decay characteristic. Therefore, you can use it not only to create bongos, but also for fat compressed kicks! The built-in gain control circuit (saturating CV instead of the audio signal) prevents distortion from excessive amplification. Lublin is DC-coupled, so you can use it to process CV as well as audio signals.

Width 6HP, Depth 33mm (including cable bracket)
40mA/-20mA

Notes: The Endorphin.es 1U Cockpit X Black is a newly designed 6-channel stereo mixer with transparent VCAs, featuring four inputs on the front and two auxiliary inputs on the rear. Sidechain ducking makes it easy to get a great balanced sound, just input the trigger of your sound and you are good to go.

The perfect mixer for summing signals in your system while patching, or even as an end-of-chain mixer to go into your interface, mixer... whatever you fancy.

Power consumption: 55mA at +12V and 35mA at -12V

Depth: 30 mm

24 HP

Notes: A spectral processing playground.

Bandit is a fun combination of band-pass filters, VCAs, and routing options.

It serves multiple functions including equalizer, crossover, multiband VCA, 4 band spectral mixer, and spectral external FX insert point.

It allows you to:

Cut or emphasise different frequency bands of a signal, acting as a voltage-controlled equalizer/isolator.
Split a sound into four different frequency bands for external processing, and if needed, insert them back
Mix four different signals with predefined tone placement in the mix.
Create four different sounds from one sound source by modulating the volume with four different envelopes.
Create evolving timbres by modulating one or more frequency bands using LFOs or audio-rate modulation.

Specs

Current needs: +12V: 80mA, -12: 70mA, 5v:0
Width: 8 HP
Depth: 30mm (including power connector)

Notes: The MetaModule Audio Expander (MetaAIO) adds an additional 6 CV/Audio inputs and 8 CV/Audio outputs to your MetaModule patches, via a ribbon cable connected to the main MetaModule. The MetaAIO provides the same high-quality as the MetaModule's Audio/CV jacks (24-bit, 48kHz default, up to 96kHz).

Notes: What's that I hear? You want grit and filth for your system? Tired of not having enough harmonics in your signal? Maybe all your sounds are a bit too cold and sterile?

Why not a light inside your system with the Optika VCA - two independent optical VCAs with drunken muscles and a chip on their shoulder, they can go nice and easy on your signal, or they can inject it with a hot dose of raw power that'll give you guitar-face in no time.

The vactrols? Hand made in my workshop, of course, guaranteed cruelty-free, no dolphins harmed and zero palm oil. The sound? You'll get that slewy, chewy, turn-your-triggers-into-envelopes mess that you love vactrols for, but with the utmost care taken to minimize bleed and all the other things we don't always love about vactrols.

Yes, great, you've got lots of VCAs with "clean gain on tap" and "exemplary responsiveness" and all that other stuff - please excuse me if I'm yawning with utter boredom and rolling my eyes- now, get yourself a fully analog optical VCA that'll make your hairs stand on end when you push the gain into distortion and press the vactrol into saturation.

Use it for stereo, use it for two signals, use both channels in sequence, but please let your signals go towards the light and put it to use! Don't make me beg

Notes: ***B-STOCK: Product with some signs of usage but in perfect working order***


The Mutant Rimshot is a fully analogue rimshot and clave generator inspired by the rimshot found in the legendary 909 drum machine; a triple bridged-T oscillator coupled with a state variable filter. The clave sound (not a feature of the original 909 rimshot) is achieved by using just one of the oscillators.

Features

Three oscillator modes

Rimshot HI mode brings classic rimshot sounds
Rimshot LO gives a lower pitch range; try playing with the filter on this setting to get low tom and kickdrum sounds.
CLV (Clave) mode uses just one of the oscillators to give you a brighter, higher percussive sound.
A switch on the back lets you select between original and extended pitch modes. Original mode can give you rimshots exactly modelling that of classic machines (in Hi mode), whereas extended mode gives a wider range of pitch, at the expense of classic accuracy.

Three filter modes

Use the lowpass or highpass filter modes for classic sounding rimshots
Highpass and bandpass can give a wider range of clave and rimshot sounds, as well as completely different percussive elements (especially when turning the resonance up!)
VCF IN lets you blend the clave or rimshot with other sounds. Try adding some filtered noise for a more acoustic sounding rimshot, or for pseudo-snare type sounds.

Novel decay and filter mod controls

The MOD DECAY envelope controls the decay of the VCA envelope
The VCF MOD attenuverter allows you to modulate the filter cutoff with the MOD DECAY envelope
Alternatively, a switch on the back lets you modulate the filter cutoff with the pitch-controlled internal VCO, for filter FM style percussive hits.

Technical specifications

Width: 8HP | Depth: 30mm
Current draw: +45mA, -50mA @ 12V

Notes: DASSBRUM is a powerful kick module capable of producing a wide variety of sounds, ranging from classic kick tones to complex folded timbres. It features an analogue core processed through a digitally controlled matrix of analogue wave folders and envelopes, offering deep sonic flexibility in a compact 8HP form factor. A built-in sweet spot mode ensures optimal pitch envelope relationships for consistently punchy and dynamic kicks.

Consumption: 120mA +12V /30mA -12V
Width: 8HP
Depth: 29mm

Inputs maximum ratings
Fold type (rear switch): 0/5V
Trigger IN: 5V (>0.5V)
Other inputs: -5/10V

Notes: The mmMidi is a simple & compact MIDI interface for your Eurorack synthesiser. It translates two independent channels of MIDI note, velocity and gate information to corresponding control voltage signals via either a classic MIDI DIN type connection or as a driverless USB MIDI device.

The mmMidi also converts MIDI Clock to analogue x24 fixed clock and run outputs (i.e DIN Sync). The optional mmT expander provides a third MIDI channel of 8 key mapped gate outputs.

Requiring minimal configuration and a pain free set up, the mmMidi makes it easy to sync Pam's clock to your DAW, control multiple synth voices, and trigger drum or sample modules with the optional mmT expander. The new USB-C connection makes it easy to drive your modular not just from your computer but also via your tablet, phone or any USB MIDI Host.

(Note: New 2025 mkII version adds USB-C functionality.)

Technical Specifications

Power: +12V 50mA / -12V 0mA
Size: 4HP
Depth: 38mm
MIDI response latency: 200-400 uSec
Resolution: Factory calibrated 12 bit 0-8V CV outputs. +5V gates

Notes: A rock-solid all-rounder of a VCO, the Cycle 5 is a triangle-core oscillator with morphable wave shapes as well as conventional sine, triangle, saw and pulse outputs. Switchable octaves and 5th transposition make the module even more user friendly.

Supplier's Notes:
A small Eurorack oscillator that packs a punch: that's the best way to summarise Cycle 5.

At its heart lies a refined high-stability triangle core voltage controlled oscillator (VCO), with performance matching or exceeding that of much bigger and costly oscillator modules.

Instead of a coarse frequency knob, a 7-position octave switch is provided. This in combination with a perfect fifth transposition switch and factory pitch tuning, makes Cycle 5 an exceptionally straightforward and musical VCO to use: simply centre the fine tune knob, and the module will be instantly tuned to reference C.

Meanwhile, its dual precision volt per octave inputs add a great deal of versatility. For example, one could be used for pitch sequencing and the other as a generic exponential FM input, or both sequenced together for transposition effectsithe dual inputs serving as a built-in precision adder.

Sporting all the classic waveforms, ranging from sine wave, triangle, saw and square/saw, as well as a hard sync input and low frequency oscillator (LFO) mode, Cycle 5 makes for a real workhorse VCO. The novel trigonometric waveshaper results in a very clean sine wave, ideal for sub bass duty.

Cycle 5's highlight however, is its vari-wave feature. By adjusting the vari-wave knob, the waveform on the matching output will smoothly morph from sine, to triangle, saw, square and finally a very narrow pulse. The vari-wave parameter can be CV controlled, up to audio frequencies for some intense timbres.

Equally at home as a modest modulation companion to big VCOs, as being in the spotlight in miniature or polyphonic systems, Cycle 5 might just be the most multi-talented tiny analogue oscillator yet.

6 HP | +12: 75 mA, -12: 70 mA

Notes: The aux mix 1U is a 3-channel stereo mixer module with a stereo auxiliary send bus. The routing options on this mixer module make using aux mix 1U for send FX, parallel processing, feedback mixing, and more possible. It is designed for audio signals only (not for mixing CV). It is AC-coupled, and uses audio-grade, logarithmic attenuators for a smooth, even response across the entire volume range.

Each channel has a dedicated pair of inputs for stereo audio sources. The left channel inputs are normalled to the right for mono audio sources. All three channels feature a precise level attenuator, a mute switch, and an LED input activity level indicator. The three stereo channels are mixed and summed to the main outputs, where they can be patched out to a wider Eurorack system or external pro-audio equipment. The output stage features soft-clipping diodes for smoother saturation when signal levels are very high.

In addition to the main mix controls, channels 1 & 2 also feature an aux level attenuator with a pre/post switch. These can be used to create an independent aux mix which is routed to another pair of outputs, separate from the main mix. The aux output stage also features the same soft-clipping diodes as the main output. aux mix 1U has four 3-pin connectors on the rear side for directly routing audio between other Intellijel cases & modules - without the need for patching cables. Connections include aux in, aux out, chain in & chain out. This also allows you to chain multiple aux mix 1U modules together to form even bigger mix chains.

Notes: Designed by Hexinverter, from classic electro snares to warping, alien percussion, the Mutant Snare is a radical departure from the static sounds of the TR-808.

13HP
30mm deep
+50mA, -50mA
Eurorack format module

Notes: A classic electro percussion synthesis design reborn as something completely different. Hexinverter wanted to recreate a classic hihat synthesis design as something new and exciting, so they took the super electro 808 circuit and transformed it into a powerful creative tool for modular synthesis.

13HP
30mm deep
+75mA, -45mA
Eurorack format module

Notes: The iconic clap sound of the TR-909, but with all the features we all wished the original had. Hexinverter's take on this design adds some much-needed range and depth. The clap is a highly versatile module - it is a voltage-controlled LFSR noise oscillator as well as a powerful percussion synthesis engine.

13HP
30mm deep
+75mA, -45mA
Eurorack format module

Notes: What do you get when you combine voltage controlled distortion and one of the most infamous bassdrums? Hexinverter took one of the most revered bassdrum synthesis designs of all time - the TR-808 and completely redesigned it for use in a modular analogue synthesiser.

13HP
30mm deep
+55mA, -45mA
Eurorack format module

Notes: The Stereo I/O 1U is an all-in-one audio input/output module designed to bridge the gap between your Eurorack system and line-level devices. Whether you want to process external audio with your modules, monitor your patch with headphones, or connect your system to mixers or interfaces with line level - Stereo I/O 1U has got you covered.

Audio I/O allows you to effectively interface your Eurorack modular system to the balanced line-level world (+4 dBu). You can send and return to rack mount/desktop fx units, patch to external line-level instruments like synths and drum machines, interface to a DAW and much more.

The rear-mounted 3-pin CHAIN IN connector allows you to sum (in parallel) other audio sources to go from Eurorack level to the BAL LINE OUTPUTS. This could be from modules like the Mixup 3U, Xfade 1U, Stereo Mix 1U, and XY I/O 1U. You could also use this to connect with the 3-pin headers on the Palette and 7U cases audio i/o boards.

The rear-mounted 3-pin CHAIN OUT connector allows you to directly connect the level-shifted BAL LINE IN to the inputs of other compatible devices such as the Mixup 3U, Outs 3U, Stereo Mix 1U, XY IO 1U, and Headphones v2 1U. You could also connect the to the TRS jacks of the Palette and 7U cases audio i/o boards.

Dual Balanced ins and outs for the studio or the road. Interface your rack with the balanced line level world; send and return to pedals or desktop FX units; patch in and out of your DAW, external synths, drum machines and other line-level instruments.

A space-friendly, feature-rich, highly flexible solution for all your stereo line level input and output needs. Includes a dedicated headphone jack/volume and a clever cue bus for monitoring signals outside of the main output or to add a 2nd source to the main outputs.

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


Voltage-controlled Dual VCO/LFO - two oscillators independently set as VCO or LFO.

Features in VCO mode:
V/Oct tracking over 10 octaves
Through zero and linear FM
Sub-octave output
Hard & soft synchronization
VCA control and CV algorithms selection
Quantizer with various scales
20 algorithm-based synthesis types among:
Wave shaping
Phase modulation
Phase positioning of multiple waves
Up to 5 stacked oscillators in tunable unison
Self-sync with phantom oscillator
Additive synthesis (7 waves)
Variable bit reduction (bit-crushing)
Ring modulator with its own 2nd oscillator
Noise with LPF, BPF, or resonant filter
Features in LFO mode:
Simultaneous signal and trigger outputs
External wave synchronization
Clock controlled rate with voltage controlled multiplier and divider
CV and knob control of output level
Algorithm based wave engine with a selection of:
Wave shaping
Phase modulation
Random levels and vectors (also Brownian)
Randomly spaced triggers and waves
Display with contextual icons and instant reminder help text
LEDs indicating potentiometer vs. value matching, switch settings and output levels
Automatically saved settings for instant recall at power on
Firmware update by playing an audio file via the front panel
Compact and skiff-friendly module

The driving idea behind the Twin waves voltage-controlled dual oscillator/LFO is to offer two interesting oscillators in a skiff-friendly and compact size. To achieve that challenge, Klavis built the product's architecture on the concept of pre-defined algorithms, where the most useful configurations and their matching parameter are ready to use.

This MKII evolution brings a redesigned layout, additional knobs for more hands-on fun and semi-modular cross-patching between sections.

All of the original features are present: a top selection of synthesis techniques, each with their key parameter directly at hand, enriched by a full set of complementary features.

More than ever, the Twin Waves is versatility at its best.

Dimensions:

(mm) Height: 128.40, Width: 40.40, Depth: 21.00
(Inches): Height: 5.06, Width: 1.59, Depth: 0.83
Eurorack: Height: 3HE, Width: 8HP
Depth behind panel (no supply cable inserted)- 21.00mm, 0.83 inches

Current draw
+12V: 46mA
-12V: 18mA
+5V: 0mA

Notes: Rings is a resonator, the essential ingredient at the heart of several physical modeling synthesis techniques. The resonator transforms an external, unpitched excitation audio signal into a full-bodied pitched sound. Rings is the bar, the tube or the bunch of strings you cause to vibrate with a bursty external signal.

Any signal can be fed into the resonator, including envelope clicks, trigger signals, noise bursts, even tonal sounds. It also contains a special "polyphonic mode", where four notes can ring together at the same time. Although it is not truly polyphonic, it adds density and chordal characters to the sounds output. For those wanting the functions of Elements without the losing HP real-estate, Rings is exactly the solution.

Three families of vibrating structures are simulated by the module, with CV control over their parameters:

Strings, membranes and tubes as modelled by Elements' resonator section (modal synthesis).

Strings coupled together and vibrating in sympathy, with controllable intervals between them.

Strings with a variable amount of inharmonicity.

Rings can be configured so that each new note is played on its own virtual string, while the previously played note(s) still decay. This unique take on polyphony allows the module to play strummed chords.

Controls

Number of strings/structures (1, 2 or 4).
Synthesis model (modal, sympathetic strings, string).
Main frequency (quantized in semitones).
Structure. With the modal and string models, controls the inharmonicity of the spectrum (which directly impacts the perceived "material"). With the sympathetic strings model, controls the intervals between strings.
Brightness. Specifies the brightness and richness of the spectrum.
Damping. Controls the damping rate of the sound, from 100ms to 10s.
Position. Specifies at which point the structure is excited.

Inputs and Outputs

Frequency, structure, brightness, damping and position modulation CV inputs with attenuverter (-8V to +8V).

"Strum" trigger input to indicate when a new polyphony voice needs to be allocated. Normalized to an edge detector detecting changes on the main V/Oct input, or sharp transients on the audio input. Detection threshold at 0.6V.

1 V/Oct frequency input (-1V to +5V).

Resonator audio input, normalized to a filtered pulse/noise burst triggered by the "Strum" input (for stand-alone use). Modular level, up to 16Vpp.

Two audio outputs, splitting the signal into even/odd partials in monophonic operation, or even/odd notes in polyphonic operation.

Specifications

Module width: 14HP
Module depth: 25mm
Current draw: 120mA @ +12V, 5mA @ -12V

Notes: Welcome to the Rosci soundscape. Rosci is a digital VCO that generates random waveforms to create unique, rich, and full sounds. You are able to control how complex the sound is-add harmonics and have a completely unique shape generate using the generate button/trigger. BUT, it can also be tuned to output basic waveforms (sine, square, sawtooth) if you so desire.

Tunable parameters breakdown:

COMPLEXITY: Essentially a generation of unique timbre.
ROUNDNESS: Set the basic shape of your waveform. Go from from sharp to soft sound, similar to filtering.
HARMONICS: Add up to 6 harmonies to your sound. The choir's here.
FORMANTS: Accentuate certain overtones in your sound (like a voice singing "ooo", "ahh", "eee").
DETUNE: Add a classic 'detune' with a changing phase wave for extra wide sound.

How does it work?

It is a pipeline of algorithms, which generates and modifies a waveform starting from top to bottom. Rosci works on a principle of key points: the generate button generates key point location and amplitudes to be passed down the pipeline.

Tunable parameters:

Beginning with complexity, you set the number of key points (even numbers only to create a waveform). Lowest complexity sets two points, and highest complexity sets up to 20 points. The number of key points will vary with each waveform generated. From there, the roundness sets the type of interpolation of the key points, from square to sine. Adjusting the harmonics creates copies of the waveform and adds them to the original waveform at double, triple, ... up to 6x the base frequency. Formants maintains the frequency of the wave, but squishes it so there is 'empty space' in between (this is also called pulsar synthesis). Finally, detune copies the waveform and 'detunes it' by increasing the frequency ever so slightly. And there you have it: a unique Rosci soundscape :)

Technical specs:

Module Size: 3U X 6HP X 25 mm Deep.
Current Draw: 160mA@ 12V, 20mA@ -12V.

What's in the box:

1x Rosci module
1x User Manual
1x Power cable
2x Mounting screws

Notes: ***B-STOCK: Product with some signs of usage but in perfect working order***


A fresh twist on a simple 303-style acid synth, featuring a triangle/sawtooth/square wave VCO, multi-mode resonant filter, simple AD envelope and a VCA which can be overdriven. Excellent value.

Supplier's Notes:
ADDAC started this module with the idea of developing a complex drum source however, somewhere along the process, it was clear how much better it performed as a synth voice and this lucky accident was embraced.

It features a VCO with a [FREQUENCY] and [FINE TUNE] knob plus a dedicated CV Input and Attenuator knob (tunable over 4 octaves).

The VCO waveform output is achieved by selecting either a Triangle or Saw through a switch. the selected waveform can then be mixed/balanced against the square wave. The resulting mix is then sent to the Filter.

The Filter features a [CUTOFF] and [RESO] resonance knob plus a Cutoff CV Input and Attenuverter knob.

A 3 position switch is used to select the filter type: Highpass, Bandpass or Lowpass.

The resulting output is then sent to the VCA.

The VCA features an Input with [INPUT GAIN] knob which at maximum can amplify the incoming signal by a factor of 2.

This is a very important control, it accepts any signal Trigger, Gate or CV. Whatever input is plugged in the signal is then fed through an AD with a very short attack and controllable decay through the [VCA DECAY] knob plus the CV Input and Attenuverter knob. The resulting slewed signal is then used to control the VCA gain.

This signal is also sent to the CV OUTPUT as well as the LED monitor.

The Accent input adds to the Input signal creating a different amplitude output.


The CV OUTPUT is normalled to the Frequency and Cutoff inputs.

Tech Specs:
9HP
4cm deep
80mA +12V
80mA -12V

The [INPUT GAIN] knob

Usually Attack/Decay envelopes have a maximum voltage of +5v, no matter if the input gate is +5v or above the AD will clip at +5v. In this case, this clipping method was not used, and instead ADDAC allowed the incoming voltage to determine the maximum AD voltage, meaning that if a +5v gate is present then the AD maximum voltage will be +5v but if a gate of +10v is sent then the AD maximum voltage will be +10v.
This also means that with higher input voltages the decay, although falling at the same speed, will be longer than with lower voltages as it has a longer range to go back to 0v.

As previously mentioned, The [INPUT GAIN] knob can amplify the incoming input by a factor of 2, allowing to use a standard +5v gate or envelope and being able to make the resultant AD go up to +10v.

The AD signal is responsible for opening the VCA. Up to +5v the VCA will open to unity gain above this value the VCA will start to amplify and eventually saturate and distort. This saturation will add harmonics to the signal which will change its gentle timbrical nature to a more unique and peculiar timbre that will make the module shine in Acid contexts.

Adding high levels of Resonance or even filter self oscillation in combination with high VCA saturation will create even more harmonics that ADDAC highly encourage the user to explore.

Notes: The First Aid Kit is here to be your first choice, regardless of whether you're picking out your first utility module, building a minimal system or expanding a large system, by offering a powerhouse toolbox built on the principle of "everything you need, nothing you don't."

Offering ten functions in just 8hp, you can feel assured that you are no longer likely to run into dead ends while patching, because you need just one more utility - no need to buy lots of specialized utility units either, which can be both costly and space ineffecient, as you get all in one with the First Aid Kit.

Functions include:

5v DC source
Buffered multiple
LED voltage indicator
Summing 3-to-1 mixer
Signal inverter
Half-wave rectifier
Full-wave rectifier
Gate-to-trigger generator
Attenuverter
Bipolar and unipolar 8v offset generator
Functions can be used independently of each other, and the unit can be patched with itself for even more functions. Enjoy a toolbox that will solve nearly any problem you're facing, all in a compact-yet-comfortable 8hp.

The First Aid Kit replaces lots of other individual modules, and gives both newcomers an excellent starting point for what can feel like boring but necessary purchases, while also offering excellent utility to both large and small systems.

The First Aid Kit: don't get caught without one when you need it most.

Notes: Module A-135-5 is a combination of a voltage controlled polyphonic mixer and a polyphonic suboctave generator.

Module A-135-5 is a combination of a voltage controlled polyphonic mixer and a polyphonic suboctave generator. It is made of 12 voltage-controlled amplifiers (VCAs) which are arranged in form of a 4x3 matrix. Herewith up to three four-voice polyphonic signals (e.g. the outputs of three polyphonic VCOs A-111-4) can be mixed. The level of each of the three polyphonic channels (A, B, C) with four voices each can be controlled manually or by means of an external control voltage with associated attenuators.

In addition, the module features four frequency dividers which derive the suboctaves from the four input signals of channel A. The suboctave signals are wired to the switching contacts of the sockets of channel B. As long as the sockets of channel B are not patched the suboctave signals of channel A are used as inputs for channel B. The suboctaves are symmetrical rectangle waves with half the frequency of the corresponding signal A. For example, two polyphonic VCOs A-111-4) can be used and patched to the channels A and C. Channel B then provides the suboctaves of channel A.

The switching contacts of the 12 input sockets and the four outputs are internally connected to pin headers. That way the module can be internally pre-patched to other polyphonic modules (e.g. the four inputs A to an A-111-4, the four inputs C to another A-111-4 and the outputs to the polyphonic filter A-105-4). As the switching contacts of the sockets are used for the internal pre-patching the internal patch can be overridden by using the sockets at the front panel.

Technical notes:

If required two or more modules can be cascaded when more than three polyphonic channels are required.

The max. overall amplification is less than 1 to avoid clipping (can be altered to amplification 1 by replacing resistors, but then clipping may occur)

The max. input levels without distortion are about 16Vpp (or -8V ... +8V for the processing of control signals)

The voltage range for each of the CV inputs is about 0...+5V (with corresponding attenuator control fully CW), higher control voltages (e.g. 0...+10V) can be adjusted by means of the attenuator control

The suboctave levels are about 5Vpp

The module should be used only with DC coupled VCO outputs (e.g. A-111-4, A-111-3). With AC coupled VCO outputs (e.g. A-110-1, A-110-2) a DC offset will occur at the outputs when the suboctave option is installed.

The document A135_5_INTERNAL explains the positions and functions of the internal pin headers and describes the cascading of two A-135-5

Notes: Another iconic Buchla module gets the Eurorack reissue treatment courtesy of TipTop. The 242t is the brand's unique voltage-controlled clock and trigger module, generating pulses based on a 4x12 matrix.

Supplier's Notes:
The Buchla and Tiptop Audio 242t Programmable Pulser is a reissue of the time-event-based generator from the 1970s 200 series. At its center is the Pulser, a voltage-controlled clock oscillator with a wide frequency range, extending up to audio frequencies, numerous outputs, and start/stop controls. The Pulser drives a programmable matrix with three rows of up to 12 stages: (A), (B), and (C). Stages are activated using the X/Y coordinate controls, and the total number of stages can be set using the (n) row. Clock and Reset inputs allow the 242t to sync with other devices, while the Reset input can also be used to control the number of stages with external pulses.

Notes: The Morphor Sequencer - Quad Gate/CV is a versatile tool for both live Eurorack performances and songwriting. This module can be configured as a 2-, 3-, or 4-track sequencer, depending on the selected output configuration. With flexible track configurations and intuitive real-time step editing, this sequencer offers a handy approach to sequencing in modular systems being only 4 HP wide.

Whether you're controlling gates, CVs, or a combination of both, this module adapts to your creative needs with ease. Key features include up to 4 independent tracks, each capable of holding up to 16 pages containing up to 16 steps. Users can configure tracks as gate, CV, or combined gate/CV tracks, and even set up triad chords. The module supports customizable step lengths, glide times, individual track playback orders and reset behaviors making it ideal for creative sequences.

This module can operate as a standalone unit using its internal clock or be easily synchronized with an external clock source for integrated use within a larger system. The clock and reset jacks can function as both inputs or outputs, allowing flexible configuration to match your setup.

For expanded setups, multiple Morphor Sequencer modules can be daisy-chained via the bus connection on the back, ensuring that clock and reset signals are shared seamlessly across all connected modules. This makes it easy to sync multiple sequencers for complex, multi-track performances or compositions.

Specifications

Panel width: 22 HP
Panel height: 1 U
Module depth: 33 mm
Dimensions: 39.65 x 111.4 x 33 mm
Mass: 56 g
Power Socket: 16-pin

Current draw:
12 V: 95 mA
-12 V: 11 mA
+5 V: 123 mA

Notes: Pretzel Logic is a 4 bit to 16 step addressable analogue sequencer which outputs gates. Each of it's 16 steps can be addressed in any order for ultimate creative flexibility. It pairs nicely with Polygraf, High Towers and Akropoli; together they make a powerful combination.

It features 4 address inputs, 1, 2, 4 and 8, each of which has an associated input socket as well as a 3 position state switch which allows each address input to be held high, respond to input signals, or held low. Each input has two status LEDs. The red LED displays the signal present at the input socket, while the green LED displays the status of the address input. The combination of signals present at the input sockets, together with the positions of the state switches allows Pretzel Logic to have 16 different output states, numbered from 0 through to 15. The output state of Pretzel Logic can be ascertained by observing which of the 4 address inputs are high. So, for example:

- If no green status LEDs are on, Pretzel Logic is in output state 0

- If green status LED 4 is on, Pretzel Logic is in output state 4

- If green status LEDs 1, 2 and 4 are on, Pretzel Logic is in output state 7

- If green status LEDs 2 and 8 are on, Pretzel Logic is in output state 10

The input sockets may be addressed by various external modules, for example:

- FC Pocket Calculator, FC High Towers, or similar clock dividers with multiple outputs from other manufacturers.

- FC Polygraf or similar grid editors from other manufacturers.

- FC Little Melody, Akropoli or similar.

As Polygraf is capable of storing many user patterns which themselves are selectable by CV, multiple chained patterns are possible. Furthermore, we accept that users will discover their own unique combinations of FC and third party modules to address Pretzel Logic, always bearing in mind that at any time the status of any of the 4 input sockets may be overridden by the 4 state switches. Pretzel Logic may be latched manually via the Latch toggle switch, or externally via the Latch input. When Pretzel Logic is latched, the last output state to go high is held until Pretzel Logic is unlatched.

Notes: Inspired by classic 70s analogue drum synths like the Syncussion and Syndrum, the Eurorack version of the Seven Sisters offers seven different sound modes, each with four CV-controllable parameters.

Supplier's notes:
Seven Sisters is a percussion synthesizer featuring seven voices that aims to capture the essence of late '70s instruments such as the Syncussion and Syndrum.

This module contains 7 presets, with one voice playable at a time. Each voice has four editable controls, including volume, and parameters such as decay, pitch, and filter, all of which can be controlled via CV. Each voice also includes multiple oscillators, noise generators, and filters, providing rich, complex tones beyond the capabilities of the original devices. This enables you to recreate classic sounds or craft more realistic snare, hi-hat, and cymbal effects. The result is a powerful percussion synthesizer that combines the essence of early drum synthesis with modern flexibility.

Notes: This versatile dual-function Eurorack module offers both a Low Pass Gate (LPG) and a Voltage-Controlled Amplifier (VCA), inspired by two iconic designs in synthesiser history.

Low Pass Gate (LPG)

The LPG is modeled after the classic Buchla design, delivering a rich, organic sound that blends amplitude control with low-pass filtering. Ideal for producing natural-sounding dynamics, the LPG responds to control voltages to create plucky, percussive tones and smooth, woody textures. Its distinctive vactrol-based architecture provides a warm and unique character, adding depth and nuance to your patches.

Voltage-Controlled Amplifier (VCA)

The VCA draws its inspiration from the legendary Minimoog, ensuring a clean, dynamic, and responsive performance. Known for its iconic smoothness and headroom, this design is perfect for traditional amplitude shaping, allowing precise control over audio signals with minimal distortion. The VCA section excels in both subtle modulation and aggressive signal sculpting, making it a versatile choice for any patch.

Power consumption: 30mA at +12V and 47mA at -12V

Depth: 27mm

6 HP

Notes: The MCO MK II is a highly versatile digital VCO and voice module inspired by 90s/00s digital synths shrunk into just 6HP.

It offers a broad collection of unique, high-quality synth voices, each with extensive, customizable parameters. These parameters can be directly controlled or modulated through assignable internal and external sources. Certain per-voice parameters support audio-rate modulation, including FM, sync, and DSP. Each voice also supports up to four-voice chords, external-triggered envelopes, multiple LFOs, and dual audio outputs for comprehensive desktop like synth functionality.

Voices include a multi dimensional wavetable oscillator based on the original MCO, a complex additive synthesis engine, a multi mode 'JP' type digi-synth, a lush virtual analog implementation, a fully featured vocoder, a bass synth for both kicks and sub sonic tones and finally arebirth and porting of our discontinued SID GUTs chip voice.

Each voice includes factory presets as well as the ability to store and recall user presets. All state is preserved across power cycles.

The MCO is designed to be familiar, quick and easy to use with a high resolution colour display and a rich visual user interface.

A USB-C connection allows for easy firmware updates, user wavetables upload and device config backup and restore. Axon expander modules are also supported to increase CV control options.

Notes: PM DB25 MKII is an expander output for the MKII versions of the Performance Mixer and Channels.

Pre-fade and Post-fade connections are available for all channels. The DB25 has 16 outputs. All mixer channels are stereo, so one DB25 handles the main PM MKII (either pre or post), and the DB25 can handle 2x Channels (either pre or post).

Simply connect the cable to the Pre or Post headers on the back of the PM MKII or Channels MKII modules to choose pre/post.

The PM MKII has an additional header with both Aux Sends, Master Bus, and Submix Bus.

Connect a DB25 cable of your choice to the front connector and then straight to your DAW or recording interface.

For use with original WMD Performance Mixer, an adapter board can be added on. Please note that width behind panel is increased by 8mm when adapter board is added on. This may require some clever position in your case. The original Performance Mixer still only offers Pre Fader Outputs.

Notes: SWEnigiser Proto VCF/A

Enigiser multimode filter and VCA in 12hp. Circuit based on originalEnigiser prototype kindly loaned by Anthony Linell of Northern Electronics.

VCF
Unique configuration with 3 x 4 filter modes
2x audio input with drive
2x cutoff CV attenuverter inputs
1x cutoff CV input, tunable to 1v/oct

VCF output normalized to VCA input.

VCA
1x audio input with gritty drive, normalized from VCF output
2x CV input. CV1 knob adds offset for drone etc.
CLIP switch for old/new revision Enigiser diode setting adjusting drive character.
+12V 22mA
-12V 22mA
Skiff friendly
Includes power cable, 4 screws+ plastic washers

Available in sand blasted silver and black panel versions.

Notes: Solist is not your average performance mixer and mute combination - far from it. Designed in collaboration with Bries, Solist contains four channels of soft vactrol muting, controlled by tactile and pleasantly clicky mechanical switches. Solist will help make your performances shine - but most importantly, the red solo switches allow you to override the current state of the mute switches, allowing for creative transitions between solo and mute states during your performance.

While the audio circuit is fully analogue, it is also entirely isolated from the digital circuit that controls the mutes. Running on a fast and reliable Raspberry Pi RP2040, you get all the benefits of digital control without the downsides of digital audio processing. Best of all, the mechanical state of the switches determine the state of the module, so even if you power cycle, you will return to your previous state.

The analogue mixer section can be used simultaneously with the individual outputs of the Solist, so for those who already have a mixer solution, the buffered individual outputs will bypass the mixer entirely. You may of course also use both simultaneously for exciting parallel processing opportunities.

Solist brings a whole new aspect of muting and soloing to your Eurorack performances, and with soft opening and closing vactrols, you'll never have to worry about clicks, truncated transients or actuation noise.

Notes: What does this do?

This is an analogue filter with a separate 3 channel mono mixer, and VCA combo. There is also an internal envelope generator with Decay. All this product needs is a VCO and a trigger signal to complete a mini voice.

The outputs on the filter are meant to be manually patched into one of the VCA audio inputs on the module to complete the mini voice. You can mix and match to create custom filter types.

The Feedback on the product 'Rez', is what makes this sound like an MS20 filter. There are diodes, used as a limiter, and also to wave shape when in self oscillation mode.

Features:

-2 audio inputs with 2 level control knobs.

-Bi-polar FM for the filter.

-Mod input with level knob for the filter.

-FCV Filter CV direct input for the filter.

All CV inputs for the Filter are 1V per octave, Exponential.

-REZ CV

-VOLT CUT output. +5v/5v output. Used to remote control another filter, with the master 'Cut' knob.

-Internal Envelope Generator, with Level Sends to VCA and Filter.

-Separate VCA circuit, with 3 channel mono mixer input.

-1 CV input for the VCA. 'VCV'.

-1 VCA output.

The filter will self oscillate into a sine wave and does track 1v per octave.

Width: 16HP

Current: +65mA,-65mA

PCB Stack: 1 Level, Skiff compatible.

Notes: ***B-STOCK: Box opened, product in perfect working order***


Tiptop's reissues of iconic Buchla modules continue with the 285 frequency shifter. Edgy, twangy harmonic modulation with ring mod options and stereo operation via sum and difference outputs.

Supplier's Notes:
The 285t combines two sets of functions: the top section features a frequency shifter, while the lower section includes both balanced modulation and classic ring modulation, all with voltage control. The frequency shifter can shift incoming audio using either its internal oscillator or external audio. Both SUM and Difference outputs are available simultaneously for analogue stereo widening effects and more.

As Tiptop Audio continues its aural odyssey of preserving and transforming the hallmark engineering prowess of Don Buchla's namesake synthesizer modules, the 285t brings a constellation of blistering sonic-contouring tools to your Eurorack array. Like its predecessor, the Tiptop Audio Buchla 285t is a menagerie of modulation madness, offering variable degrees of ring, frequency, and amplitude styles of modulation. Plus, its dyad of modulation sub-modules operates independently, with dedicated audio and CV I/O for each, functionally giving you the sum of performance possibilities you'd get with two modules, all in one instrument. Suffice it to say: Sweetwater's synthesists commend Tiptop Audio on capturing the electric magic of Don Buchla's imaginative engineering while transposing it for the world of Eurorack to experience. For a constellation of timbral sculpting and summitting heretofore unknown peaks of daring synthesis exploration, the Tiptop Audio Buchla 285t Frequency Shifter module is your key. Discover what awaits at the fringes of Eurorack possibility!

Note: This module is not compatible with Buchla system voltages. CV signals require a distinct connectivity configurations. Please contact your Sweetwater Sales Engineer with any questions or concerns regarding compatibility or use in your Eurorack case.

Type: Frequency Shifter
Depth: 1.77" (45mm)
HP Size: 18HP
Power Usage: +12V/70mA, -12V/40mA
Power Supply: Requires Eurorack Case and Power Supply
Manufacturer Part Number: 285t

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


Dimensions is a true stereo chorus effect for the Eurorack modular system featuring two algorithms. The first is a direct port of our Fluid chorus plug-in, and the second is taken from the unit's namesake. With automatic routing based upon what you plug in the I/O, Dimensions can do mono->mono, mono->stereo, and true stereo chorus duties.

Dimensions' Mode A operation is a ludicrously thick chorus. Most chorus effects have either a single delay line or a pair. Dimensions has six of them, each with its own modulation scheme. The Mode B operation changes the routing to match the vintage rack unit, but keeps the controls available. This results in a subtly different, but equally thick and appealing, effect.

Notes: THE SBG-PRO supports mono, stereo, balanced, and unbalanced input and output via 6.35mm jacks with level matching controls with clipping indication. The module features both direct and voltagecontrolled equal power crossfading between wet and dry sources.

Additionally, an expression input, along with the included 'floating ring' cable and conditioned output, ensures safe, voltage-limited CV control of external devices from your modular system.

The module extends its sibling, the original S.B.G, by adding full size stereo balanced jack connections and voltage control focusing more on connectivity with not just pedals but also pro audio equipment including rack effects, 500 Series modules and mixing consoles.

Notes: SWEnigiser Proto VCF/A

Enigiser multimode filter and VCA in 12hp. Circuit based on originalEnigiser prototype kindly loaned by Anthony Linell of Northern Electronics.

VCF
Unique configuration with 3 x 4 filter modes
2x audio input with drive
2x cutoff CV attenuverter inputs
1x cutoff CV input, tunable to 1v/oct

VCF output normalized to VCA input.

VCA
1x audio input with gritty drive, normalized from VCF output
2x CV input. CV1 knob adds offset for drone etc.
CLIP switch for old/new revision Enigiser diode setting adjusting drive character.
+12V 22mA
-12V 22mA
Skiff friendly
Includes power cable, 4 screws+ plastic washers

Available in sand blasted silver and black panel versions.

Notes: Beatsi is Omni-Tone's love letter to modular drums! Inspired by classic modular drum synthesis which uses the fundamental building blocks, Beatsi's timbres were created using the same methods, only digitally. Beatsi is not a sample player or a physical modeller, and it's meant to be that way.

Beatsi's interface allows for control over individual piece Timbre, Pitch, Decay, and Level. The timbres are organized into 3 kits: an orange (acoustic) kit, a blue (low-fi) kit, and a green (alien) kit. Within these kits the timbres blend smoothly into one another allowing for seamless modulation. Beatsi has two CV modulation inputs which are assignable to any and all parameters with individual attenuversion. Beatsi may be small, but it packs a serious punch.

Technical specs:

- Module Size: 3U X 8HP X 25 mm Deep.
- Current Draw: 160mA (180mA peak)@ 12V, 10mA@ -12V.

What's in the box:

1x Beatsi module
1x User Manual
1x Power cable
1x Jumper cable
4x Mounting screws

Notes: Part of TipTop's exceptional series of Eurorack-format Buchla modules, the 264t provides four sample-and-hold circuits, plus a logic circuit designed to control polyphonic patches. Deceptively simple but surprisingly creative, like most Buchla modules.

Supplier's Notes:
Four independent sample-and-hold circuits, plus a specialized logic circuit for expediently implementing polyphonic patches.

Sample-and-hold's are essentially one-cell analog memories. They are useful for "remembering" the instantaneous value of a control voltage (a detected envelope, for example), for generating equally spaced steps from a constant slope input (as from a 281t envelope generator), and for converting any continuously changing voltage (a random voltage, for instance) into a series of discrete values.

The 264's sample-and-hold circuits have two operating modes: sample and track. In the sample mode, the value of the input is sampled and applied to the output whenever a pulse is received. The output remains at this value until the next pulse arrives. The track mode diers in that an input is applied to the output for the duration of the pulse. The output tracks the input until the end of the pulse and remains at a constant value until the next pulse.

To use the 264t as four independent channels set the separate/common switch to separate. A single CV can be set to all four channels by setting the operate/common to common and plug CV in the the back jack on the with right side.

The Model 264t includes a polyphonic adaptor, which performs the logic necessary to implement four-voice polyphony. Facilities are incorporated for fine tuning and f.m. modulating the oscillators; light emitters display the adaptor's operation.

Specifications:

Size: 18 HP - Depth: 45mm
Power: +12V 60mA / -12V 30mA

Notes: The SetonixSynth SkyWave is an all-analogue voltage controlled oscillator capable of producing many different timbres and unique harmonic behaviours, thanks to an original step-based control scheme which allows the user to dial in completely different wave-shapes and levels for successive oscillator cycles.

This complex VCO uses an internal feedback loop with the clock output of the oscillator triggering a step sequencer which in turn cycles through settings at the frequency of the core oscillator, thus changing the shape and level of the waveform output on a per-cycle basis while also staying in tune and tracking pitch like a typical VCO.

Notes: The Octovert is a CV processor capable of scaling, inverting, and offsetting up to eight polyphonic signals. It can also be externally controlled via CV! Its most obvious applications include inverting envelopes, reversing the direction of CV, and scaling plus offsetting any CV source to precisely fine-tune the modulation sweet spot of the target module. With the added feature of external control, it takes things even further by modulating the modulation signal itself for even deeper modulation motion.

Size: 6HP - Depth: 40mm

Power: +12V 18mA / -12V 15mA

Notes: Oscar DSF is a complex, stereo Voltage Controlled Oscillator, based on the mathematics of Discrete Summation Formulae.

The Discrete Summation Formula used in Oscar DSF produces sounds rich in harmonics (or 'partials') in a similar way to FM.

The mathematics of DSFs is more complex than FM, but the way that you, the user, get the sounds you want is usually simpler. The basic sound is controlled by just two, intuitive knobs (with CVs, of course).

Oscar DSF can sound like a traditional oscillator, and it can make the usual clangs and tings associated with FM oscillators. It can handle fat bass sounds, or evolving ambient drones.

Oscar DSF has two complete DSF based, complex oscillators, controlled by the same basic pitch CV, but with a pitch offset control which can detune one oscillator up to i1 octave.

The output of the each oscillator passes through another complex FM stage, which acts like a wave folder. Technically, it's actually an FM operator with the carrier frequency set to zero. It sounds great, whatever you call it.

The final piece of the signal chain is a simple VCA, allowing Oscar DSF to be used as a stand alone synth voice with the addition of an envelope generator, or some other source of modulation.

Specifications:

Width: 10HP
Depth: 22mm excl. power cable. Approx 32mm inc. shrouded power cable
Power Requirements:
+12v: 200mA
-12v: 50mA
+5v: 0mA

Inputs:

VPO (Zero attenuation): 1 volt per octave
PAR CV[Zero attenuation]: +/-5v nominal
FOLD CV [Zero attenuation]: +/-5v nominal
PAN CV [Zero attenuation]: +/-5v nominal

Outputs:
Dual/Stereo: +/-5v nominal, +/-11v max

Notes: Alpha Duo is a stereo precision VCA with ring modulation, overdrive and distortion.

Alpha Duo's VCAs have three modes:

1) Two quadrant, for classic VCA behaviour
2) Four quadrant, where the VCA responds to both positive and negative Gain CVs. This creates a classic ring modulator.
3) In four quadrant separate (4S) mode, each of the two VCA channels is controlled by separate gain CVs, turning Alpha Duo into two independent VCA/ring modulators.

Alpha Duo also features three drive modes.

1) In Drive Mode zero the overdrive circuit is not active, giving a clean signal.
2) Drive Mode One is a tube style soft overdrive. Like a tube, the positive and negative parts of the waveform are distorted differently, producing a pleasing, warm fuzz.
3) Drive Mode Two is a harder clip - more like a transistor amplifier - for a harder edged distortion.

Alpha Duo's signal path is DC coupled, so it's great for processing CVs as well as audio.

Specifications:
Width: 10HP
Depth: 22mm excl. power cable. Approx 32mm inc. shrouded power cable
Power Requirements:
+12v: 200mA
-12v: 50mA
+5v: 0mA

Inputs:
Signal (Zero attenuation): +/-5v nominal, +/-12v max
GainCV [Zero attenuation]: +/-5v nominal
Pan CV [Zero attenuation]: +/-5v nominal

Outputs:
Dual/Stereo: +/-5v nominal, +/-11v max