Serge Slopes (DTG) / Extended ADSR

This 4x4 module combines a Dual Universal Slope Generator mk2 in a slim version with an Extended ADSR. The Serge Dual Universal Slope Generator (DSG) is probably the most versatile module of a Serge Modular system, incorporating a wide range of functions for both CV and audio. This 2" incarnation is powerful both in the audio range as well as clock and envelope generator. Thanks to the audio inputs, it can also be used as a filter / LPG. The DSG mk2 version has been optimized for audio performance and speed/precision. The left side covers a frequency range up to more than 10kHz. It also offers improved tracking and some temperature compensation.

The Extended ADSR is a complex envelope generator that not only uses the four segment envelope normally encountered in synthesizers, but is designed with extra features such as an initial voltage controllable delay time, voltage control of each segment, switchable slope forms, and a master voltage control. Each segment may be manually set and voltage controlled. In addition to the normal Attach, Decay, Sustain, and Release segments, an Initial Delay time is included. A master 1V/OCT inout allows to control all slope times for effects such as decreasing the entire envelope time as the pitch of an associated oscillator increases - a phenomenon is typical of many acoustic instruments.

"Slopes / ExtADSR" is available as a DIY (semi-)kit or - upon request - as complete (built) module. The kit contains:

Serge Dual Slope Generator mk2 &
Serge CV Processor

The Serge Dual Universal Slope Generator (DSG) is probably the most versatile module of a Serge Modular system, incorporating a wide range of functions for both CV and audio. Some functions for which one Slope Generator can be used: 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).

From the catalog: "The Universal Slope Generators are unity gain voltage followers with voltage controllable slopes. The range of control is exponential, extremely wide, and the Rise and Fall times can be controlled independently. The range of the Slope Generator is from sub-sonic to high audio frequency. Trigger inputs and trigger outputs allows each section of this dual module to function as a transient (envelope) generator, pulse delay, or in a "cycling mode" (to produce an LFO or clock). Since the Rise and Fall times are voltage controllable, this adds another dimension to the above functions.

The DSG mk2 version has been optimized for audio performance and speed/precision. The top section covers a frequency range up to more than 10kHz. It also offers improved tracking and some temperature compensation.

The Random*Source DSG mk2 comes in 2 variants which differ in the top section (only):

• contemporary provides a (red = gate) Pulse output with a fixed duty cycle (instead of the bipolar out). Please note that the panel will (incorrectly) say "BIPOLAR" (see photo) but the red banana jack should make things obvious.
• classic features the (black) Bipolar output on both sides.

Either variant of the DSG mk2 is available as a DIY (semi-)kit or as complete (built) module. The DSG mk2 kit contains (see DUSG mk2 build docs):

DSG CVPRO 4x4 module: € 595 AVAILABLE (may take 5-10 days)

*** This is 4U format - not eurorack! ***

module (DSG CVPRO 4x4 module)    595 EUR

Serge Variable Q Filter / R*S Stereo Mixer

The combination of the extremely versatile Serge Variable Q Filter (VCFQ) and the R*S Stereo Mixer / Panner is an ideal output module which combines high-end audio specs (including balanced outputs) with massive sound-shaping power.

The unique Serge Variable Q Filter (VCFQ) is an excellent general-purpose VCF that provides simultaneous low-pass, high-pass, band-pass and notch (band-reject) outputs combined with unique flexibility. Its trigger in, LOW mode and self osciallation allow a variety of uses from Oscillator to VC processing. With the support and approval of Serge Tcherepnin, the Random*Source version of the filter uses high-end VCAs by THAT for superb audio performance.

The Equal Power Stereo Mixer / Panner by Random*Source is designed to emulate the behavior of the famous Serge VCAs. It uses some of the best audio components available today including THAT2180 VCA chips. Version 1.1 contains a number of additions and improvements that were adopted in surface mounted technology (SMT):

The R*S Stereo-Mixer has two independent channels for stereo panning and provides level control (or enveloping) as well as voltage controlled panning. Two Aux inputs allow to mix in other signals (not affected by control voltages or knobs) and to chain mixers. The output is available at a pair of banana jacks as well as (6.35mm / 1/4") TRS jacks (phone connectors) for connecting to external amplifiers, ADCs etc.

Serge VCFQ StereoMixer 4x4 module: € 715 AVAILABLE (may take 5-10 days)

*** This is 4U format - not eurorack! ***

module (Serge VCFQ StereoMixer 4x4 module)    715 EUR

Serge Sequencer / Programmer 8

The Serge Sequencer / Programmer 8 (SQP8) can be used as a push-button, manual programmer and/or sequencer. The pushbuttons not only allow to select a certain stage, but also to set the length of the sequence in performance while a sequence is running. Other sequencieng capabilites include RESET, UP/DOWN and HOLD pulse inputs as well as a GATE output which allows to use the pushbuttons as a simple mini-keyboard. Another unique feature is the A minus B output which outputs the difference between the A and the B output.

The R*S version is optimized for speed and use in the audio range. This allows the use of the sequencer similar to a wavetable oscillator - using a clock of 8kHz (eg from a DSG mk2) generates output waveforms with a base frequency of 1kHz that still have sharp edges.

Serge Sequencer 8 4x4 module: € 595 AVAILABLE (may take 5-10 days)

*** This is 4U format - not eurorack! ***

module (Serge Sequencer 8 4x4 module)    595 EUR

Serge Smooth & Stepped Generator
Random Source

The Serge Smooth and Stepped Generator (SSG) is an essential Serge module with an enormous variety of uses both for CV and audio. According to the 1979 catalogue, “it is a complex multi-functional module which can be patch programmed to provide various slew and sample functions. The Smooth section will place a postitve and negative slew on input voltage transitions for lag effects, voltage controlled portamento and for low frequency filter applications.” In Cycle-mode (cycle jack patched to the input), the Smooth side “will oscillate yielding a voltage controlled traiangle wave LFO. A high level into the HOLD input will enable the Smooth Function to be used as a track-and-hold circuit with voltage controlled slew rate. The Stepped funtion can be used as a sample-and-hold with voltage controlled slew rate limiting. In Cycle mode, a pulse applied to the Sample input will generate complex staircase waveforms for control voltage applications and for use as audio signals. The Coupler is an internal comparator which compares the output levels of the Smooth and the Stepped Generators. This output is useful for generating complex control voltages or random voltages.

The Serge Random Source (RS) combines a Serge Random Voltage Generator (RVG, left column) and a Serge Noise Source (right column) in one module. As the name suggests, the Random Voltage Generator produces random voltages which vary in a smooth or in a step-wise manner. Random timing pulses are also available. The Noise Source (NOI) provides both white and pink noise waveforms. The S/H SRC generates a special (“noisy”) waveform as an ideal input for Sample & Hold functions to produce random voltages of equal probability (similar to a 1/F distribution function). In addition, the Noise Source features a random voltage output which can be stepped through random voltages by sending trigger pulses or using the pushbotton.

The Random*Source SSG+RS module is available as a DIY (semi-)kit containing:

Serge Filters

The Serge Variable Slope filter (VCFS) and Variable Resonance filter (VCFQ) is an combination of the two famous and essential filters of the Serge system. The The VARIABLE Q VCF (VCFQ) is an excellent general-purpose VCF that provides simultaneous low-pass, high-pass, band-pass and notch (band-reject) outputs combined with unique flexibility. Its trigger in, LOW mode and self osciallation allow a variety of uses from Oscillator to VC processing. The Variable Slope filter (VCFS) allows the amount of filtering to be dynamically controlled as well, from barely perceptible filtering to highly resonant, sharp cut-offs. The VCFS has an unrivaled unique, organic characteristic. With the support of Serge Tcherepnin, the Random*Source version adds abjustable resonance - expanding the filter's character way beyond what's been possible with the original version.

Serge Dual Extended ADSR

The Serge Dual Extended ADSR (ADSR) contains two complex envelope generators. Each ADSR uses not only the four segment envelope normally encountered in synthesizers, but is designed with extra features such as an initial voltage controllable delay time, voltage control of each segment, switchable slope forms, and a master voltage control. Each segment may be manually set and voltage controlled. In addition to the normal Attach, Decay, Sustain, and Release segments, an Initial Delay time is included. A master 1V/OCT inout allows to control all slope times for effects such as decreasing the entire envelope time as the pitch of an associated oscillator increases - a phenomenon is typical of many acoustic instruments.

The Random*Source ADSR module is available either as a DIY kit or as full module:

Serge Divide & Compare

Divide & Compare provides a number of mathematical and logical functions for all sorts of rhythmic effects. The module combines a Serge Divide by N Comparator with a Pulse Divider and Boolean Logic.

The Serge ÷N COM is a sought-after and essential Serge module (1" wide) covering a number of functions: comparator, voltage-controlled pulse divider, and voltage-controlled staircase generator.

As the name suggests, the Pulse Divider takes a pulse train in and provides multiple simultaneous divided outputs, including odd-numbered divisors like 5 or 7 - great for creating polyrythms. The module can be jumpered so that the top input of the Inverter in the Boolean Logic section (also) acts as a RESET input. Boolean Logic offers two inverters as well as OR, AND, and XOR (exclusive or) gates and is ideal combine triggers in various ways. Like the Pulse Divider, it can be used in the audio range, too. offering two inverters, and OR, AND, and XOR gates.

For those interested in history, the Pulse Divider is based on a core design by Ken Stone - many thanks to Ken! Pulse Divider and Boolean Logic have been part of many Serge Systems even though they are not not original Serge designs. Divide & Compare is a great companion for the Sequencer 8.

Serge Divide & Compare 4x4 module: € 595 AVAILABLE (may take 5-10 days)

*** This is 4U format - not eurorack! ***

module (Serge Divide & Compare 4x4 module)    595 EUR

Serge New Timbral Oscillator (NTO)

The Serge NTO, Serge's legendary oscillator featuring variable wave outputs and much more, is now available as a SMT pcb set with all SMT parts already reflow soldered in.

Serge Variable Slope Filter (VCFS)

The Variable Slope filter (VCFS) was nearly impossible to get over decades. It allows the amount of filtering to be dynamically controlled, from barely perceptible filtering to highly resonant, sharp cut-offs. The VCFS has an unrivaled unique, organic characteristic. The R*S version has a new Q knob and has been optimized for a wider sonic range. The through-hole version can be ordered here.

Serge Divide by N Comparator (÷N COM)

The Serge ÷N COM is a sought-after and essential Serge module (1" wide) covering a number of functions: comparator, voltage-controlled pulse divider, and voltage-controlled staircase generator. The Random*Source version of the Serge ÷N COM consists of a main pcb and a matching component pcb serving as an interface to the front panel.