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


A characteristically unique take on mixing from Buchla, with six mono inputs and a built-in mic/guitar pre-amp. Each channel can be cued to a monitor mix, while the first and last channels also include voltage-controlled panning.

Supplier's Notes:
The Tiptop 207t is a modern reimagining of the classic Don Buchla 207 Mixer/Preamplifier from the 1970s 200 Series. This stereo mixer comes with a built-in preamp that allows you to boost external instruments and microphones, making it a versatile tool for any modular setup. The 207t also features a six-channel mixer with a variety of signal routing options, including the ability to route channels to the monitor and L&R signal outputs, with per-channel control over loudness and panning.

Each channel has a Mon switch that sends the channel's signal to the monitor outputs, which are always full-volume and summed to mono, making it useful for basic monitoring applications or rudimentary mixing. The Prog switch sends the signal to the L&R signal outputs, with loudness controlled by the Level Adjustment slider and panning determined by the Channel Assignment knobs. The first and sixth channels offer voltage control of panning; these channels are hard-panned when no CV is applied.

The preamp section features a 1/4" input and multiple gain settings, making it suitable for use with external line level instruments, electric guitars, or dynamic microphones. The continuous amplification control provides added flexibility for your audio needs. Finally, the Expansion In is a stereo input that sums to the left and right main outputs, which is great for chaining multiple 207t modules or adding another stereo source at the final output.

While the 207t's functionality may be simple, it is an essential part of any 200t system, serving as the glue that holds everything together. The Tiptop 207t is a fantastic mixer/preamp option that delivers quality sound and reliable performance.

Buchla 207t Features

Mixer/preamp module based on Don Buchla's original 207 design
Six-channel mixer with per-channel level control and panning
Voltage-controllable panning on channels 1 and 6
Manual panning on channels 2-4
Program switches can act as channel mutes for main outputs
Mon switches route signal (in mono) to Monitor output
Expansion input useful for stereo chaining and more
Re-designed preamp for high audio fidelity
Preamp suitable for use with external instruments, electric guitars, dynamic microphones, and more

Eurorack module
28hp wide

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


The Wave Transformer is a complex single oscillator with 7 audio outputs. Its method of wave shaping differs from other complex oscillators in that it is not based upon classic wave folding such as is common in West Coast synthesis, or filtration such as is common in East Coast synthesis.

This analogue, vintage-voiced, voltage-controlled oscillator features over 8 octaves of accurate pitch tracking. Its 7 simultaneous wave outputs include a unique Complex output. This strange and novel output varies between a simple waveform (triangle, unless you patch a signal into the Shape Insert jack) and a complex transformation of the harmonic structure of the original waveform. It contains a unique mixture of the fundamental frequency, odd order harmonics, even order harmonics and subharmonics. The Sub Octave panel control will determine whether the sub harmonics are derived from one octave down, two octaves down, or are muted altogether. It will vary from a simple waveform to a silhouette of your cat watching you as you react to a "present" that it left for you on the counter. No, seriously.

The module's Transform control morphs from a basic waveform through many strange iterations into a complex, gnarled mass of audio mutations at the Complex output using an asymmetrical multi differential audio transmutation circuit. You can yield countless variations on these permutations by combining this novel circuit with Hard Sync, Soft Sync, Linear FM and Exponential FM.

Additionally, you can mute the source waveform to use the circuit as a harmonic gate/VCA, rendering the Wave Transformer a voice unto itself.

If that is not enough, there is a Shape Insert that allows you to transform external oscillations and modular-level audio sources.

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


The 'Mega Milton' is a smorgasbord of handy all analogue utilities in just 8HP that will greatly extend the functionality of your Eurorack system.

It includes a stereo line input converter for incorporating line level external sources into a Eurorack system, a fixed 4 input mixer with breakout attenuator for combining signals, a gated slew limiter for adding slides to sequences, a sample and hold with analogue white noise with a myriad of uses such as generative melodies or producing percussive textures and finally a buffered mult for droop free signal distribution with handy LEDs to monitor.

All sections are normalised to help with typical use cases such as generating random CV from the sample & hold section, a smooth random source from the slew output and breaking out a standalone attenuator from the fourth mixer input.

The 'Mega Milton' provides essential classic synthesizer building blocks for patching in any Eurorack system.

Ideal For

Incorporating stereo external sources easily into your Eurorack system.
Signal attenuation and basic mixing in a small space.
Building percussion sounds from an analogue noise source.
Producing clocked random to add interest and variation to patterns and sounds.
Adding gated 303 style slides to patterns.
Creating and Manipulating patterns with Sample and Hold.
Buffering and monitoring voltage across multiple VCOs or other destinations with no drop.

Tech Specs

Supply: +12V 70mA / -12V 70mA
Size: 8HP
Depth: 32mm

Notes: The "uMM" combines a MIDI merger and two independent THRU distributors in a module that is only 4 HP wide. All sockets on the module are in MIDI TRS-B format.

At the heart of the two-input MIDI merger is a small, powerful ARM processor with plenty of buffer memory. Two MIDI streams are mixed to one output and can also be tapped via an additional second output. Two LEDs signal the operation of the merger: one LED indicates MIDI activity at the inputs, and a second LED warns of too much data at the inputs.

The second group of functions consists of two independent, separate MIDI THRU distributors. The MIDI data at the respective MIDI input can be picked up and distributed at the three THRU outputs. If required, a 1-to-5 distributor can be created from the two units by connecting an output of the left group to the input of the right group.

Features:

4x MIDI IN (TRS-B)
2x MIDI-OUT (TRS-B)
6x MIDI-THRU (TRS-B)
Powered via Doepfer connector

Notes: Another update for WMD's clever dual VCA, this time a little bigger to give more control. Digital control of CV and attenuation gives lots of creative options. Third time's a charm.

Supplier's Notes:
WMD have done several designs of this circuit over the years, the first one had no knobs, the second was too small, the MKIII is finally how this circuit should be packaged. This module does some really cool stuff and is super useful in any system.

The Digital VCA lets signal through like a normal VCA, but the CV and attenuation level is controlled digitally. This lets us do things like wait until there is a zero crossing to change the amplitude, resulting in clickless amplitude changes.

The Trigger mode causes the VCA to only update when a trigger is received. The addition of a noise circuit for each side let us do a very quick and easy sample and hold that never droops. With no input, 5V is normaled to the attenuator, so you get a 0-5V sample and hold. In Bipolar mode, you can get -5 to +5V.

Both sides have bipolar VCA mode (polarizer), which lets them invert the signal when negative CV comes in. Also known as ring modulation. With the zero crossing detector, this can produce some super wild wave shapes.

Features

Dual VCA Design
Unipolar or Bipolar Operation
DC Coupled Analogue Signal Path
Low Distortion / Low Noise
VCA Closes Completely
Zero Crossing Detector Mode
Trigger Mode
Two Independent Noise Sources
8 bit CV resolution
Great for Fast Envelopes and Sine Bass Sounds

Specifications

Power: +65mA, -45mA
Width: 8HP
Depth: 35mm with cables
Height: Eurorack 3U (128.5mm)
Board Height Behind Panel: 112mm
CV/Signal Input Impedance: 100k
Output Impedance: 1k
UPD in 3.3V Threshold Schmitt Trigger
ZCD produces 15us 5V pulse
5V CV to fully open VCA
Linear VCA response
20Vpp signal handling

Notes: Really nice take on an arpeggiator module here. Four-channel design features editable arpeggio patterns, CV control and transposition. Real-time performance meets customisable melody generation.

Supplier's Notes:
Four-channel arpeggiator with customizable patterns and CV control

Opp Ned is a four-channel arpeggiator designed for creating patterns that can be modified with CV. Opp Ned ships with 12 of Noise Engineering's favourite arps, including tetrads, major, pentatonic major, minor third, and pentatonic minor, but you can edit and save custom arpeggios to twelve memory slots. Recall your custom arpeggios manually or with CV using the Ptn input. If you ever want to restore the factory arps, just head to the Noise Engineering Customer Portal.

The transpose input makes it easy to combine Opp Ned with external sequencers, too!

Arps have never been easier than with Opp Ned.

Features

Size and Power
8HP Eurorack
+12v: 60mA
-12v: 10mA

Opp from Norwegian Opp for "Up"
Ned from Norwegian Ned "down"
"Ups and downs"

What's in the box

Module
Power cable

*** Noise Engineering no longer include screws with newly packaged modules. Bulk screws are available for purchase. ***

Notes: Space-conscious lowpass filter and volume processor.

A combination of VCF + VCA + Mixer that lets you mix three different sound sources, and shape their tone, and levels in a breeze.

The Pony Filter is built around the SSI2144 FATKEYS Chip. Has the elegant sound of the classic transistor filter without the associated distortions, due to Dave Rossum's "improved ladder" topology.

Features

3 Channel Mixer (Out normalized to channel three for feedback)
Temperature-compensated Q and frequency.
Compensated Volume VS Resonance
2 Cuttof CV INs.
CV 1 Selectable routing Cut-Off or Cut-Off+VCA
Voltage controlled Q
Two Segment Peak Meter

Specifications

Four-pole, 24 dB/octave
Current needs: +12V=50mA, -12V=45mA
Width: 6 HP
Depth Assembled Version: 22mm
Depth DIY Kit Version: 40mm
Designed, kits prepared and assembled in Barcelona.

Notes: CV Random is a random CV generator with 4 types of randomness and a triggerable sample-and-hold function.

Sliders allow you to set the internal clock tempo (RATE), shape the probability of triggering (PROB), blend old with new values (RND) and set the shape of all four random outputs (SHAPE).

4 different sliders

RATE

Sets the tempo of the internal clock. The CV input below the slider adjusts the clock rate, with 1V/oct calibration when the CV attenuverter is 100%. Upon each clock trigger, the RATE slider light blinks, and there is a chance for the internal random source to generate a new value.

PROB

This probability is set by the PROB slider, and if a new value was generated, the PROB slider light blinks and a pulse is emitted from the TRIG output.

RND

When the internal random source generates a new value, it mixes the previous value with a random value, with an amount specified by the RND slider.

SHAPE

The SHAPE slider sets the shape of all four random outputs. At its lowest position (0%), all outputs immediately jump to the new random value (the target value) when the clock is triggered.

At non-zero positions, the outputs interpolate between the previous and the target value, using a different behaviour for each output.

Internal random clock source

Whenever the clock activates, the RATE slider's light flashes. At the same time, there's a chance that the internal random source will create a new value, depending on the PROB slider's setting.

If it does create a new value, the PROB slider's light flashes too, and a pulse comes out of the TRIG output.

External IN & TRIG inputs

If the TRIG input is patched, the RATE slider is ignored, and the internal clock is only triggered when an external trigger is received. The PROB slider is used to filter this trigger by applying some probability.

Self-modulation

Thanks to a switch in the back of the module, you can normalize the LIN output to the 4 CV inputs and adjust the amount of modulation for each parameter with the attenuverters.

This adds another layer of randomness to your results, enabling more dynamic and unpredictable outcomes.

SHAPE Outputs

The STEP output jumps to the new value in one step at 0% SHAPE, and divides the transition into 16 steps at 100% SHAPE.

The LIN output immediately reaches the new value at 0% SHAPE, and takes the whole clock cycle to do so at 100% SHAPE, staying constant in between.

The EXP output shifts exponentially, becoming linear at 100% SHAPE, with its pace adjusted by the SHAPE slider.

The SMTH output transitions smoothly, with the speed controlled by the SHAPE setting, holding at the target until the cycle ends.

Specifications

Dimensions 10HP - 50×128,5mm
Current 63 mA +12V / 11 mA -12V / 0 mA +5V
Input & Output Signals +/-10V
Impedance Input 10k - Output 10k
Materials PCB and Panel - FR4 1,6mm
Depth 40mm including connectors (Skiff friendly)

Notes: An ultra-compact 10HP VC filter with bags of personality. Camber can be treated as a subtle, non-intrusive sound design tool, or something much more lively.

Camber is designed to be a fun, tactile filter with a small footprint. It's sound is neutral enough for basic filtering without a fuss, with a much more aggressive tone available using high resonance settings in three-pole mode.

Filter Core

The core of the filter is based on a state variable topology using 2164 VCAs and 1% tolerance integrating capacitors. Resonance and feedback control is provided by the fantastic circuit design originally by Neil Johnson "Voltage Controlled 3-Pole State Variable Filter" recently made available in Sound Semiconductor documentation.

Operation

Camber is switchable between low pass and high pass responses with one pole (6dB) and three pole (18dB) flavours of each. It has full CV control of both cutoff frequency and resonance amount. The input is DC-coupled allowing LFO and CV signals to be routed through the filter. The filter will also act as a simple oscillator producing a clean sinusoidal signal with the resonance control turned *almost fully clockwise, and no signal at the audio input. Dialling in the resonance so that it is just under the point of self-oscillation allows the filter to be "Pinged" by sending gate signals to the audio input. This is useful for tuned percussion sounds and FX.

Specifications

Intellijel 1u format
Width 10HP
Depth 33mm
Power requirements ~40mA +12V/~40mA -12V
Control voltage range 0-8V
Impedance Input 100K / Output 1K

Notes: Lush analogue EQ switchable between tilt and Baxandall high-shelf configurations.

Perform a variety of mixing and sound design duties ranging from subtle brightness and clarity adjustments to low-end rumble removal, boosted low-pass filtering and sweep EQ.

In the default tilt mode, turning the control knob clockwise simultaneously boosts treble and cuts bass. Turning anti-clockwise boosts bass and cuts treble. These boosts and cuts are pivoted around the mid-range. With the control knob at 12 o'clock the frequency response is neutral.

With Baxandall high-shelf mode enabled, turning the control knob clockwise past 12 o'clock introduces and gentle high-shelf EQ weighted around the upper mid-range. Turning the control knob anti-clockwise results in a wide high-shelf cut with subtle bass and mid-range adjustments.

Patching the channels in series allows for radical sound shaping and band-pass responses. Each channel provides up to +/- 8db of low and high-frequency gain control, summing into a low noise output stage. Hot input signals over 15vpp are saturated by active Zener diode clipping.

Features

Precise voltage control of EQ tilt and shelf
Seamless switching between EQ modes
High-quality components used throughout

Specifications

Intellijel 1U format
Width 18HP
Depth 32mm
Power requirements ~60mA +12V/~58mA -12V
Control voltage range 0-8V
Impedance Input 100K / Output 1K

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


The Furthrrrr Generator has a main oscillator (carrier) with an extensive and fully voltage controllable wave multiplier and a modulation oscillator (modulator) that can cross-modulate the carrier. Each oscillator has hard and soft sync and also features an integrated tuner: if both LEDs are lit the VCO is at note A. Left LED is lit at note Ab and right LED at A#. Frequency potentiometers are ten-turn models and thus allow for easy tuning. Frequency range of the VCOs is 10Hz-10kHz (and much lower in modulator's LFO mode). Both VCOs feature 2 frequency CV inputs (1x with bipolar attenuator, 1x with 1V/octave), one FM input (jumper selectable between linear and exponential FM) as well as separate input for hard and soft sync. The voltage characteristic can be selected between 1V/octave and 1.2V/octave (Buchla norm).

The main oscillator (carrier) outputs the waveforms sine, saw, square and white noise. The two outputs marked with the magic eye are outputs of the "harmonic section" that generates very complex sounds by the wave multiplier and its parameters symmetry, order and Furthrrrr in the module's right-hand section. Symmetry lowers the level of even harmonics and amplifies the odd harmonics (this affects the pulse wave's width as well). Order adds saturation to the high order harmonics and resembles a low pass filter. Furthrrrr alters the level of harmonics set by the other parameters and produces very interesting, partly brute sounds with lots of harmonics by clipping and folding the wave. All three parameters can be voltage controlled. The carrier oscillator also has inputs for hard and soft sync, the sync-switch can synch directly to the modulator.

The modulation oscillator (modulator) has three wave forms with direct outputs: sine, saw and square. Using the internal modulation via the "mood section" the waveform is selected with a button; an additional staircase wave form is available here, but it can be overridden by inserting a signal into the external input socket. A switch activates the LFO mode.

The Mood section is responsible for the internal modulation of the carrier by the modulator. Switches determine the modulation destination(s) that can be activated simultaneously. These are the Furthrrrr parameter of the harmonic section, the amplitude and the frequency of the carrier oscillator. The "balanced" switch activates the ring modulation between both VCOs. intensity of modulation is controlled by the "mood index" potentiometer and the according CV input with bipolar attenuator.

Notes: Four-channel arpeggiator with customizable patterns and CV control

Opp Ned is a four-channel arpeggiator designed for creating patterns that can be modified with CV. Opp Ned ships with 12 of Nosie Engineering's favourite arps, including tetrads, major, pentatonic major, minor third, and pentatonic minor, but you can edit and save custom arpeggios to twelve memory slots. Recall your custom arpeggios manually or with CV using the Ptn input. If you ever want to restore the factory arps, just head to the Noise Engineering Customer Portal.

The transpose input makes it easy to combine Opp Ned with external sequencers, too!

Arps have never been easier than with Opp Ned.

Features

Size and Power
8HP Eurorack
+12v: 60mA
-12v: 10mA

Opp from Norwegian Opp for "Up"
Ned from Norwegian Ned "down"
"Ups and downs"

What's in the box

Module
Power cable

*** Noise Engineering no longer include screws with newly packaged modules. Bulk screws are available for purchase. ***

Notes: An ultra-compact 10HP VC filter with bags of personality. Camber can be treated as a subtle, non-intrusive sound design tool, or something much more lively.

Camber is designed to be a fun, tactile filter with a small footprint. It's sound is neutral enough for basic filtering without a fuss, with a much more aggressive tone available using high resonance settings in three-pole mode.

Filter Core

The core of the filter is based on a state variable topology using 2164 VCAs and 1% tolerance integrating capacitors. Resonance and feedback control is provided by the fantastic circuit design originally by Neil Johnson "Voltage Controlled 3-Pole State Variable Filter" recently made available in Sound Semiconductor documentation.

Operation

Camber is switchable between low pass and high pass responses with one pole (6dB) and three pole (18dB) flavours of each. It has full CV control of both cutoff frequency and resonance amount. The input is DC-coupled allowing LFO and CV signals to be routed through the filter. The filter will also act as a simple oscillator producing a clean sinusoidal signal with the resonance control turned *almost fully clockwise, and no signal at the audio input. Dialling in the resonance so that it is just under the point of self-oscillation allows the filter to be "Pinged" by sending gate signals to the audio input. This is useful for tuned percussion sounds and FX.

Specifications

Intellijel 1u format
Width 10HP
Depth 33mm
Power requirements ~40mA +12V/~40mA -12V
Control voltage range 0-8V
Impedance Input 100K / Output 1K

Notes: Tilt is the first in Laine's series of core modules, which will take cues from the main product line and strip back the features so both the module width and cost can be shrunk dramatically.

Comprising an 'Ambler' style tilt EQ network similar to the 'Stilts' topology, Tilt allows simultaneous cut and boost of low and high frequencies using a single control.

Tilt control circuits are known for the transparency of their cut and boost curves, coupled with the inherent emphasis gained from cutting one end of the frequency spectrum whilst boosting at the opposite end.

It sounds pretty good on all audio source material but is especially suited to tracking drums, guitar and lead, or manipulating effects sends and returns.

With the control knob at 12o'clock the sound passed is neutral. Turning the control knob clockwise will boost high and cut low frequencies pivoting from a fixed mid-range point. Turning the control anti-clockwise below 12 o clock will in turn boost low frequencies and cut the highs.

In addition to the EQ there is a soft clipping network which will begin to saturate signals over 15 volts peak to peak.

Tilt uses the same high quality OPA op amps, Alpha pots and ENIG PCBs as found in our main product line.

Features

Compact EQ tilt control in 1U
Soft clipping network
High-quality components used throughout

Specifications

Intellijel 1U format
Width 8HP
Depth 28mm
Power requirements ~10mA +12V/~10mA -12V
Impedance Input 100k / Output 1k

Notes: Neat little interface module to help pad controllers play nicely with Eurorack. Hook up a device like a Launchpad or APC and jam out rhythms with retriggering options, dynamic control and MIDI sync.

Supplier's Notes:
Triggerpad is a dynamic trigger/gate sequencer in eurorack format on only 6hp. A USB MIDI controller with an 8×8 grid like Launchpad or APC is used to display and edit the patterns (see the list of compatible controllers). The user experience is tailored to live performance and detailed composition: dial in simple rhythms or complex polyrhythms, retrigger at audio rate, create dynamic percussions with velocity triggers or use longer pulses to create steppy modulations.

By using USB MIDI controllers that you might already have and maybe not use anymore, we avoid producing more plastic. Give your old gear a second life!

Dimensions & consumption

Width: 6hp
Depth: 39mm
+12V: 120mA (without USB MIDI controller connected)
-12V: 20mA
5V: 0mA
USB MIDI controllers consume up to 150mA on +12V

Connectivity

8 dynamic trigger/gate outputs (0-10V)
USB MIDI Host
Clock in
Clock out
Reset in
Reset out

Compatibility

Launchpad Pro Mk3
Launchpad X
Launchpad Mini Mk3
Launchpad Mini Mk2
Launchpad Pro
Launchpad Mk2
Launchpad S
APC Mini Mk1
APC Mini Mk2

Notes: Advanced generative sequencer featuring mutes per channel and transposition facilities.

Akropoli is an extension and enhancement of our successful Little Melody and High Towers modules, offering the features of both of these modules as well as some of it's own unique features such as mute buttons per channel, manual transpose knob and 1V/oct transpose CV input. Akropoli operates using Frequency Central's proprietary TOOL V2 code, and can count in integers as well as multiples for even more subtle and evolving variations.

Akropoli is a generative sequencer based around clock divisions and a chromatic quantiser, used to create in-the-moment licks and riffs. It is more that the sum of it's parts.

Akropoli's internal operations can be considered as 4 clock dividers patched into a CV mixer via attenuators. The attenuators select notes over a 5 octave range, the clock dividers determine how often those notes are added to the mix. The final output of Akropoli is quantized chromatically for fast set up and continuously pleasing results. Akropoli has an onboard transposition knob, as well as a 1V/oct transposition CV input.

The 4 clock dividers are labelled A, B, C, and D. They all receive clocks from the same source, the divisions may be selected using the presets and the individual division selectors. The clock dividers can be set to count up, down, or to one of a variety of modes that move between counting up and down. For further information on Presets and Modes see the Little Melody User Guide.

Additionally, each clock divider has it's own binary output (either high or low), these 4 outputs can be used to clock/gate/trigger other stuff on other modules to great effect.

Product Specifications

12V draw
50mA

-12V draw
36mA

5V draw
0mA

Depth
35mm

Notes: Lush analogue EQ switchable between tilt and Baxandall high-shelf configurations.

Perform a variety of mixing and sound design duties ranging from subtle brightness and clarity adjustments to low-end rumble removal, boosted low-pass filtering and sweep EQ.

In the default tilt mode, turning the control knob clockwise simultaneously boosts treble and cuts bass. Turning anti-clockwise boosts bass and cuts treble. These boosts and cuts are pivoted around the mid-range. With the control knob at 12 o'clock the frequency response is neutral.

With Baxandall high-shelf mode enabled, turning the control knob clockwise past 12 o'clock introduces and gentle high-shelf EQ weighted around the upper mid-range. Turning the control knob anti-clockwise results in a wide high-shelf cut with subtle bass and mid-range adjustments.

Patching the channels in series allows for radical sound shaping and band-pass responses. Each channel provides up to +/- 8db of low and high-frequency gain control, summing into a low noise output stage. Hot input signals over 15vpp are saturated by active Zener diode clipping.

Features

Precise voltage control of EQ tilt and shelf
Seamless switching between EQ modes
High-quality components used throughout

Specifications

Intellijel 1U format
Width: 18HP
Depth: 32mm
Power requirements: ~60mA +12V/~58mA -12V
Control voltage range: 0-8V
Impedance Input: 100K / Output 1K

Notes: The Serge GTS is a complete redesign of the famous Serge Dual Universal Slope Generator (DUSG) by Serge himself - with a new core, optimized for speed and tracking. Like some of the clones it can be used for CV, but also provides exceptional audio performance: transient rise times as fast as 13us and a maximum cycle speed of 27kHz.

Some functions for which one Slope Generator can be used:

Function generator for linear, logarithmic, exponential, stepped etc. curves
Integrate an incoming signal
Sawtooth / Pulse oscillator
Add, subtract up to 4 signals
Max and Min function
VC Transient Envelope Generator
VC LFO
VC Portamento device, Envelope Follower (Detector), VC Pulse Delay (Monostable), Sub-Harmonic Series Generator (Divider), Audio Oscillator with variable waveform symmetry (saw to triangle), Non-Linear Audio Processor (low-fidelity VCF).
Serge GTS for eurorack:

Designed by Serge Tcherepnin 2021-2023
Increased audio range (up to >28kHz)
Tracks >5 octaves as a Sawtooth / Pulse oscillator
Temperature stabilized
Eurorack format (3U), 26 hp
Power consumption: 90mA @ +12V, 80mA @ -12V
(NEW) Skiff-friendly: < 25mm (1")