Eurorack Reference

Voltage controlled low frequency oscillator with 8 waveforms and smooth morphing between each, two simultaneous outputs, and a reset input for phase sync.

4 Mode High Fidelity Looper with a 5 minute recording buffer

Four-pole, voltage-controlled OTA lowpass filter with 24 dB/oct slope, CV over resonance, and self-oscillation capable of 1V/oct sine VCO tracking across four octaves.

Analog multimode filter with a 12dB per octave slope. Simultaneous low pass, high pass, and band pass outputs with CV control over cutoff frequency and resonance.

Dual pingable envelope generator whose envelope lengths are set by the time between clock pulses or 'pings', with full CV control of envelope shape, skew, and ping division/multiplication, plus triggering and cycling options.

Compact, playable four-channel tap-tempo, pingable (clock-syncable) LFO with variable skew and reset. Each channel's speed is set by a Tap Tempo button or an external clock. Each channel can be Muted and Reset with an external trigger.

Six-channel resonant bandpass filter bank with variable Q, quantized scales, rotation/spread, stereo I/O, envelope/trigger/1V/oct outputs per channel, and extensive CV control.

Six-channel wavetable synthesizer with spherical (3-torus) wavetables, six independent VCOs with 1V/oct pitch CV, six LFOs/envelopes, stereo audio output, and onboard sphere recording from live audio.

Complex multi-tap delay in Eurorack format with velocity-sensitive force sensor for tapping delay configurations (tapographies). Up to 32 taps, each with its own delay time, amplitude/filter, and panning. Features morphing between configurations, two feedback paths, 24 saveable tapographies, a tapography sequencer, and external clock sync. Mono-in, stereo-out. Designed by Matthias Puech and 4ms Company.

4-channel performance quantizer that turns any combination of CV and gate signals into melodic pitch voltages, with per-channel note masks, offset, slew, root, range, and chain sequencing.

6x6 stereo matrix mixer, DC-coupled, expandable to larger configurations. Each knob controls the volume at one matrix crosspoint routing a stereo input to a stereo output. All left input channels are normalled to the right inputs. Ships as two modules: ADDAC814A (Jacks) and ADDAC814B (Master Controls).

A multimode filter offering simultaneous LPF, BPF, and HPF outputs in Intellijel 1U format, with CV over resonance that reaches self-oscillation.

Faithful discrete transistor replica of the Moog Model D 24 dB/oct four-pole lowpass VCF, with three-channel input mixer, vactrol-controlled voltage-controlled resonance (Emphasis), 1/3 and 2/3 CV inputs emulating original keyboard switches, variable exponential CV input, and optional overdrive jumper.

Compact digital multi-voice synthesiser in 6HP with 8 synthesis engines (wavetable, additive, JP-style digi-synth, vocoder, virtual analog, bass/kick, SID chip emulation, vocal formant), 4-voice chords, internal envelopes and LFOs, dual audio outputs, and assignable CV inputs.

The MFX is a compact 6HP Eurorack stereo digital audio multi effects processor. It offers 17 different full featured effects programs plus a number of metering utilities.

Compact programmable clocked modulation source providing 8 highly editable outputs producing various control voltage signals correlated and synced to a BPM based master clock.

Compact 4HP all-analogue low frequency oscillator with wide frequency range, voltage control, bipolar and unipolar waveform outputs (triangle, saw, sine, square), reset input, and switchable VCO mode with V/Oct tracking.

Compact envelope and function generator supporting Attack/Decay and Attack/Sustain/Decay envelopes with voltage control, morphable slope shapes, looping modes including decreasing amplitude and time, and an End of Cycle trigger output.

Four-channel multi-mode modulator with each channel outputting a variable staged slope that can act as a complex envelope, flexible LFO, or step sequence. Each slope can contain up to 13 stages with per-stage level, time, and curve controls, per-slope quantiser with 19 scales, and selectable output ranges.

Five stage function generator or modulator which operates in one of 3 modes: a multistage 'CZ' or 'Juno' style complex envelope, a super flexible LFO, and a step sequencer with per step programmable slew or slides. Each mode produces a varying output voltage moving from point to point across a set number of chained together stages.

8 channel audio & CV sampler designed for immediate real time sampling, editing and mangling within a modular context. Features Pamela's Workout style UI, CV control of all parameters, on-the-fly USB bank loading/saving, and 11 seconds of 16-bit/44.1kHz sample time per channel.

Unity gain stereo summing mixer with four stereo input pairs summed as pairs to two independent mix outs or all as a single combined mix. DC coupled for audio or CV. Top mixer outputs normalize to bottom mixer section.

Analog triangle core through-zero FM oscillator with continuous morphing waveshape, voltage-controlled FM index, built-in output VCA, voltage-controlled octave transposition, dual sub-octave pulse outputs, hard sync, and LFO mode.

Chronoblob2 is a digital delay module with four delay modes (Dual, Ping-Pong, Single, Cascade), clock sync, CV inputs for Time/Feedback/Dry/Wet, and an Infinite Loop function.

Performance stereo mixer and quad discrete VCA with four channels (each with gain, pan, tilt EQ, offset, mute, and CV input), master volume, FX send/return loops, and expansion capability for up to 16 channels.

Performative quad VCA mixer with flexible submix routing, two styles of integrated envelope followers (Side Chain and Spectral), clickless mute switches, level faders with 6dB boost, attenuverters on each channel, and patch-programmable cascading mix routing.

A unique-sounding state-variable filter with simultaneous low-pass, band-pass, and high-pass outputs, voltage-controlled cutoff, Drive switch for input overdrive, and Character switches to modify resonance response.

Voltage controlled audio feedback module with input VCA/soft clipping, 2-band EQ with boost/overdrive, envelope follower, voltage-controlled feedback loop, and crossfader between input and feedback signal paths.

Granular mono sampler for Eurorack. Reads .wav files from a front-panel microSD card, runs the microGranny 2.0 sound core. Two trigger inputs play two different samples; one CV input is assignable to any sound parameter or grain sync.

Ikarie is a uniquely sculpted, flexible stereo or dual peak filter module. It can continuously transition between lowpass and highpass filtering with a single knob, and packs an envelope follower for the incoming audio signal. Two parallel 12dB/oct state variable filter cores can run in stereo, dual mono, or series (24dB/oct). Includes internal VCA, CV control over panning and resonance, optional input overdrive, and a Beyond output for the spectral difference (twin peak filter).

Kastle v1.5 is a mini modular synthesizer with a complex oscillator, voltage-controllable LFO, and stepped waveform generator. It features 6 synthesis modes, PITCH/TIMBRE/WAVESHAPE controls with CV inputs, a headphone output, and 2 I/O CV ports. Runs on 3x AA batteries or USB power.

Digital FM oscillator with 3 internal oscillators (MAIN carrier, OCT and RATIO modulators), wave-folding, ring modulation, and assignable CTRL.

Dual voltage controlled decay envelope with dual linear VCA. Each channel has an exponential decay envelope normalized into a linear VCA. Envelopes can be configured as release envelopes via jumper.

Voltage-Controlled Voltage Processor. Two-channel utility that multiplies two input signals (A × B) and adds a third signal (C) to the result. Supports ring modulation, linear VCA, mixing, attenuation, and CV processing.

Dual Hi/Low-pass Sallen-Key VCF inspired by the early MS-20, with two independent channels, CV-controlled cutoff and resonance, attenuverters, and a Link switch for series routing.

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. Built around the SSI2144 FATKEYS chip with temperature-compensated Q and frequency, and resonance-compensated volume.

Befaco's take on the Serge/Buchla ramp generator: two voltage-controlled integrators (lag processors/slew limiters) with slope detectors, analogue logic functions (MIN/MAX/comparator), and flexible patching for envelopes, VCO/LFO, filter, portamento, and more.

Multi-function module that lies somewhere between a VCO, a Sample & Hold, and an 8 step trigger sequencer. Can function as a sequencer clocked sample & hold, analog down-sampling effect, sampling modulator/shaper, 8 step trigger sequencer, and unusual V/Oct VCO. Uses a temperature compensated ramp core VCO with more than 4 octaves of tracking.

Chaos is a six-channel aleatoric brain featuring a tunable random generator, per-channel looping (up to 32 steps), and a step sequencer mode. Each channel has an independent gate output (with probability, width, ratcheting, swing, and time control) and a CV output (with voltage window, ground transpose, quantization, slew, and external CV sampling). A master clock runs from 10 ms to 10 s; external clock sync is supported. Ten preset slots store full channel state; a Chaos function randomizes parameters within a user-defined entropy range.

Stereo VCA-based feed-forward compressor and transient shaper with internal sidechain featuring switchable HP/LP filtering, precision envelope follower, attack/release/threshold/ratio/makeup gain controls, warm tube saturation mode, bypass switch, and CV inputs for key parameters.

Experimental eurorack looper with 4 simultaneous play heads, each independently controllable for speed/pitch, direction, position, and volume. Features overdub recording, built-in effects (delay, reverb, bitcrush, tape, wavefolder), 4 assignable CV inputs, and two mono audio outputs.

A six-channel multi-mode filter module for Eurorack modular synthesizers, with six independent filter channels each having frequency, resonance, and filter type controls.

Vactrol-based Low Pass Gate inspired by the Buchla 292. Combines a 12 dB low pass filter and VCA, switchable between LP, VCA, and LP+VCA modes. Features resonance up to self-oscillation, CV and audio attenuators, and two gate inputs for mode control.

Reproduction of a legendary voltage-controlled diode ladder lowpass filter. Uses diodes (instead of transistors) as frequency-controlling elements in the filter cascade, resulting in distinctive resonance and frequency behaviour where the two parameters are not fully independent. 24dB/oct slope, self-oscillation capable.

Voltage controlled 18dB/octave lowpass filter based on a modified transistor ladder (Moog ladder), reproducing the legendary TB-303 filter circuit. Features three CV inputs, manual cutoff frequency and resonance controls up to self-oscillation.

Fourfold formant filter inspired by the Mixtur-Trautonium by Oskar Sala, consisting of four parallel resonance filters with common input and output. Each filter can be switched to low pass, band pass, or off, with separate manual controls for frequency, resonance, and level. No voltage control. Frequency range per filter approximately 50 Hz to 5 kHz.

Voltage controlled 24dB/octave lowpass filter based on the SSI2144 chip (successor to the SSM2044), with two audio inputs and CV control over frequency and resonance.

12dB multimode filter based on the Oberheim SEM circuit. Features a bandpass output and a combined low/notch/high pass mix output. Does not self-oscillate.

Voltage-controlled transistor-ladder (Moog ladder) lowpass filter with 8 internal filter stages (6–48 dB/oct). Four simultaneous lowpass outputs at 6, 12, 24, and 48 dB/oct (factory default), plus a band pass output. Three CV inputs for frequency control; external feedback input for voltage-controlled resonance.

Voltage-controlled oscillator producing four waveforms simultaneously (square, sawtooth, triangle, sine) with a frequency range of about ten octaves, controlled by Range switch, Tune knob, and CV inputs.

A noise and random voltage generator producing white noise, colored noise, and random voltage.

Voltage controlled 24dB/octave transistor ladder lowpass filter with three CV inputs, manual cutoff frequency control, and resonance adjustable to self-oscillation.

Voltage-controlled multi-mode filter with -12 dB/octave cut-off slope, four simultaneous outputs (LP, HP, BP, Notch), CV-controllable frequency and resonance, and self-oscillation capability.

Slim line 4HP voltage-controlled multimode filter with -12 dB/octave slope, four simultaneous outputs (LP, HP, BP, Notch), voltage-controlled resonance, and self-oscillation capability.

Dual multimode filter with two independent VCF channels; one provides highpass and bandpass outputs, the other provides lowpass and bandpass outputs. Includes a common frequency control, a frequency spread (Delta) control, individual resonance and CV attenuators, and a simple mixer unit. Can be used as parallel or serial dual filter, stereo filter, or cascaded with additional modules.

Dual multimode filter usable for stereo applications or as parallel/serial dual mono filters. Filter type continuously morphs from lowpass via notch and highpass to bandpass (-12dB/oct). Offers common and individual controls for frequency, resonance, and filter type, plus a frequency spread (Delta F) control.

Special voltage-controlled multimode filter with a cut-off slope of -12dB/octave, using the peculiar electronic circuitry of the EDP Wasp synthesizer. Abuses digital inverters as analog operational amplifiers. Has band-pass output and combined low/notch/high-pass output. Cannot self-oscillate.

Triple voltage-controlled resonant bandpass filter with three independent BP filter channels sharing a common audio input, each with internal triangle-wave LFO for frequency modulation, per-channel CV input, and individual audio outputs plus a summed mix output.

15-band fixed filter bank made up of 15 parallel band pass filters with fixed middle frequencies and bandwidth; each band has its own amplitude control knob for attenuation.

Vocoder analyzer section. Splits a speech/voice signal through a bank of 13 bandpass filters plus 1 lowpass and 1 highpass filter, with an envelope follower per band producing 15 CV outputs that track the spectral envelope of the input signal.

Synthesis section of the A-129 modular vocoder. Takes a carrier signal through a bank of 15 bandpass/lowpass/highpass filters, each with a VCA controlled by CV inputs from the A-129/1 analysis section, producing the classic vocoder effect. Can also be used as a standalone voltage-controlled filter bank.

Voltage controlled waveform multiplier with 4 wave-folding stages, a VCA for Multiples control, and independent manual and CV control over Multiples, Folding Level, Symmetry, and Harmonics parameters. Acts as an inverse low-pass filter, adding harmonics to signals with few harmonics (e.g. triangle or sine). Fully DC coupled.

Wave Multiplier II: generates four phase-shifted copies of an audio input signal (sawtooth, triangle, or sine) and adds them to the original to produce a fat sound similar to five independent VCOs. Phase shifting is achieved by comparing the input with a slowly varying CV; the resulting rectangle is algebraically added to produce shifted waveforms.

A simple but effective 4-in-2 stereo mixer with four inputs, each with a Level attenuator and Pan control, routing signals to Left and Right outputs. DC coupled for use with both audio and control signals.

Dual voltage-controlled switch containing two independent bidirectional switches. Each switch routes a common Out/Input to one of two In/Outputs based on the control voltage level. Two LEDs indicate which output is active.

Electronic four-position rotary sequential switch with trigger and reset inputs, four bidirectional I/O jacks, a common Out/Input, four LEDs indicating the active step, and a toggle switch to limit steps to 2, 3, or 4.

Voltage offset generator combined with an attenuator/polarizer. A toggle switch selects between attenuator and polarizer (attenuverter) modes. The DC offset is adjustable via the Offset knob, and the input signal can be attenuated or bipolar-scaled and added to the offset voltage.

Dual multi-mode filter (8 types per channel), dual looping/AD/ASR envelope generator, and stereo 16-effect FX processor (Cabin Pressure). Operates as a complete synthesizer voice when paired with an oscillator.

Versatile filter with overdrive featuring simultaneous HP, BP and LP outputs, CV control over cutoff and resonance, self-oscillation, and an adjustable germanium diode overdrive circuit on the VCF input.

Authentic sounding emulation of the famous Russian Formanta Radio Factory Polivoks VCF, using original Russian K140UD12 ICs in the sound circuit. Features independently buffered inputs, extended Cutoff knob, switchable BP/LP filter modes, and an output stage to eliminate signal inversion.

Erica Pico LPG is a vactrol-based Low Pass Gate inspired by classic Don Buchla LPG designs, featuring VCA and VCF modes, configurable resonance via back-of-module jumper, and a built-in decay envelope generator.

Polivoks-topology multimode filter in 3HP using rare Russian opamps. Offers lowpass and bandpass modes, self-oscillation, and input overvoltage protection. Suited for acid basslines, resonance sweeps, and deep wobbles.

14HPのユーロラックサンプルプレーヤモジュール。ライブパフォーマンスを念頭に設計。2チャンネル構成で、サンプルの再生・録音・スライスが可能。1V/OCTトラッキング、バーチャルVCA、ADエンベロープ、リアルタイムエフェクト、チャンネルごとに3つの割り当て可能なCV入力を備える。

Eurorack format version of the Weaver handheld sampler — a single-knob audio sampler focused on randomness and exploration, capturing two-second sound bites into hypnotic loops, with stereo output, built-in microphone, separate level controls for loop elements, three gate outputs for random rhythm generation, and CV/gate inputs for recording and knob automation.

Drum wave synthesizer with three analog drum-wave sections, a pin matrix patch bay, vactrol-gated output, and CV over each section's control knob. Capable of beats, drone, noise, and external audio processing with fuzz, filtering, and heavy distortion.

Dual all-analog fixed filter bank with two arrays of 16 independent bandpass filters, per-band VCA faders with CV inputs, envelope followers for spectral transfer/vocoding, and macro spectral editing controls (Tilt, Peak/Notch, Center, Width).

EaganMatrix Eurorack Module: full-featured EaganMatrix synthesis engine in 22HP Eurorack format, with 4 per-note CV inputs (W/X/Y/Z), 4 global CV inputs (i/ii/iii/iv), stereo audio I/O, MIDI in/out, USB MIDI, i2c port, 12 switches, 1 rotary, and LED matrix. Nominal 1 voice, max 8 voices polyphony.

6-channel attenuverting mixer/offset/scale/polarizer with 3 blocks of 2-channel attenuverting mixers using dual concentric pots. DC coupled for audio, CV, or both simultaneously.

Transistor ladder lowpass filter with integrated VCA (pre/post-filter routing), envelope follower, comparator gate output, strike input with variable decay, and user-definable CV parameter assignments. Self-oscillating resonance with auto-gain compensation.

18 HP granular audio processor with two granular engines supporting up to 88 polyphonic grains, six 10-second audio buffers, built-in condenser microphone, USB import/export, and Scan Mode, Follow Mode, and Wavetable Mode.

Dual-channel looper inspired by tape techniques. Each channel records up to 10 minutes of audio, with overdubbing, varispeed playback, multiple playheads, 1V/Oct pitch control, feedback path between decks, and a capacitive touch tape reel for flange and stall effects. Includes a 2HP passive CV expansion module.

3-channel stereo mixer module with a stereo auxiliary (Aux) send bus. Designed for audio signals only (not CV). AC-coupled with audio-grade logarithmic attenuators. Channels 1 and 2 have Aux Level attenuators with Pre/Post switches. Rear panel has four 3-pin connectors for inter-module bus chaining.

Dual channel wavefolder combining a Buchla-style parallel 'deadband' folder (P channel) and a Serge-type serial folder (S channel), with a voltage-controlled crossfader for blending the two channels, plus CV inputs, feedback routing, and symmetry controls.

Live Stereo Morphing Granular Sampler with instant access to eight Sounds, played back through a granular engine with morphable scenes and a reverb effect called Blur.

Simple, DC-coupled, vactrol-based, 1-pole passive low pass gate controlled by an external CV input. Passive module requiring no power.

A 4-stage cascaded OTA filter with dedicated LP, BP, and HP outputs plus a configurable MULTI output with 27 selectable filter modes including LP, BP, HP, Notch, Allpass, and Phaser. Features input drive with soft clipping and an asymmetric distortion circuit on the MULTI output.

4-Channel CV-Controllable Function Generator with cycling, pulse burst generation and morphing LFO. Each of the four independent channels can be configured as an AD envelope, AHR envelope, cycling envelope (unipolar LFO), pulse burst generator, or a morphing bipolar LFO. Channels can be linked together and a CV matrix allows freely assignable modulation.

Scales is an 8hp dual-channel note quantizer and step sequencer. It quantizes input voltages to notes in a user-defined scale, with two independent outputs, shift/interval control, and a 128-step SH-101-style step sequencer with storage for up to 35 fully programmable patterns.

Multi-modeled stereo character delay with reverb, modeling tape, bucket brigade, and digital delay circuits. Features per-model color controls, built-in modulator with 7 morphing waveshapes, highpass/lowpass filters in the feedback loop, lush reverb, and nine CV inputs with attenuverters.

Multimode state-variable filter in Intellijel 1U format with dedicated LP and HP outputs, switchable BP/Notch output, optional +6dB input boost and asymmetric clipping, 1V/Oct PITCH CV input, FM CV input with attenuverter, and self-oscillation capable of generating sine waves from 2Hz to 20kHz.

Multi-model stereo reverb module with a built-in SWELL Generator. Nine reverb models, comprehensive reverb controls, FREEZE/REVERSE/BURST momentary FX, and a multi-mode envelope follower (SWELL) normalled to all parameters.

Dual analog ADSR envelope generators with integrated VCAs and a voltage-controlled pulser circuit that links triggering of the two envelopes, allowing delayed one-shots, cycling organic envelopes, and complex gate patterns.

Dual analog window comparator with logic section. Two independent comparators detect when an input signal falls within a user-defined voltage window, with complementary gate outputs and a logic section combining both comparator outputs into AND, OR, XOR, and flip-flop signals.

Analogue voltage controlled bidirectional slew limiter and function generator. Can be used as a slew limiter, envelope generator, envelope follower, VC(LF)O, and more. Features separate rise/fall slope control and bending with CV, gate/trigger inputs, loop mode for oscillation, and impedance-compensated outputs.

High-stability triangle-core voltage-controlled oscillator with vari-wave morphing output, 7-position octave switch, fifth transposition switch, dual V/Oct inputs, hard sync, and LFO mode.

Analogue OTA-style 4-pole cascaded lowpass VCF with 8 simultaneous outputs at different phase relationships (LP1–LP4, HP1, BB+N, phase shifter, BP4). At high resonance, self-oscillates as an 8-phase sine wave VCO/VCLFO. Includes simultaneous exponential and linear FM, voltage-controlled resonance, hold feature, and dedicated ping input.

6-stage hybrid series/parallel diode wavefolder in 4 HP, with simultaneous main (series) and alternate (parallel) outputs, voltage-controlled fold and shape parameters, symmetry control for asymmetric folding, and an integrated soft clipper that limits outputs to approximately 10 Vpp.

Performance signal switcher/router for Eurorack. Features four buffered inputs (normalised sequentially), a lower switching section with four dual-action toggle switches (latched up, momentary down), and an upper routing section with two rotary switches plus two dual-action toggle switches. Handles audio, CV, and gates/triggers.

Digitally-controlled full-analog Granular + Multimode VCF with two simultaneous filter flows (Granular VCF and Multimode VCF), each with its own output, plus a Mix output blending both. The granular section reshapes filter response on a per-cycle basis to create subharmonics, harmonies, unison, flanging, and formant effects; the multimode section offers LP2, LP4, HP, BP, BR, and IN modes.

Dual Stereo Low Pass Gate and Mixer with two stereo LPG channels and a three-channel stereo summing mixer. Vactrol-free 100% analog design emulating classic vactrol LPG response.

The LxD (Low Strike Duo) is a dual-response, two-channel, direct-coupled Low Pass Gate using vactrols for simultaneous amplitude and frequency control. CH1 is 12dB/oct mildly-resonant; CH2 is 6dB/oct non-resonant. CH1 output normalled to CH2 input.

MATHS is an analog computer designed for musical purposes, capable of generating linear, logarithmic, or exponential functions; integrating, attenuating, amplifying, and inverting signals; and performing analog logic (OR, SUM). Functions as envelope generator, LFO, slew limiter, VCO, and more.

The Mimeophon is a stereo, multi-zone color audio repeater module by Make Noise and soundhack, coded by Tom Erbe. It morphs between Karplus, Flange, Chorus, Echo, Looping and everything in between, with full voltage control over time, space and color.

A vactrol-based, Voltage-Controlled Filter and Low Pass Gate using the QMMG core. Bridges Far East and West Coast synthesis styles, allowing for highly-resonant acidic squelch and organic, percussive animations simultaneously. Features smooth voltage-controlled sweep between Low Pass and High Pass responses, voltage-controlled Q factor with AGC, Strike input for LPG-style behavior, and Accent input for X0X-style punch.

A next generation Tape and Microsound music module that uses Reels, Splices, and Genes to create new sounds from those that already exist, informed by Musique Concrète and Microsound techniques.

Two-channel Low Pass Gate using 4 vactrols for simultaneous voltage control over amplitude and frequency content, with DAMP, STRIKE, summing stage, and AUX input.

Quad Multi-Mode Gate: a four-channel vactrol-based gate/filter with VCA, Low-Pass Gate, Low-Pass Filter, and High-Pass Filter modes per channel, voltage-controlled feedback, direct coupling, normalizations for bandpass and complex filter configurations, and a summed Mix Out.

The Quad Peak Animation System (QPAS) is a stereo multimode filter module utilizing four state-variable filter cores, with Low Pass, High Pass, Band Pass, and Smile Pass outputs simultaneously available, a pre-filter stereo exponential VCA, and Radiate controls that spread and animate resonant peaks in stereo.

Four Channel Stereo Low Pass Gate and Mixer. Vactrol-free analog LPG circuit with Vactrol button for Fast/Slow response, per-channel outputs, stereo sum output with voltage-controllable Xpread, and stereo Aux input for chaining.

The Make Noise/soundhack Spectraphon is a dual Spectral Oscillator coded by Tom Erbe of soundhack, the first module built by Make Noise on their new digital hardware platform engineered by Jeff Snyder and Tony Rolando. It uses real-time spectral analysis and resynthesis to create new sounds from those that already exist, inspired by spectral processors, additive synthesis, vocoders, and resonators including the Buchla 296 and Touché, in the lineage of the Buchla 259 and Make Noise DPO. Each of the two sides (A and B) operates independently in Spectral Amplitude Modulation (SAM) or Spectral Array Oscillation (SAO) mode.

Internally-coupled VCF and VCA based on the Korg MS-10. The VCF uses the Korg-35 filter architecture with discrete transistors (LP/HP switchable via toggle or CV); the VCA uses the MS-10 single-transistor design for characteristic color. Includes a two-channel audio input mixer.

Dual passive low-pass gate with two independent vactrol/opto-coupler channels, each with a -6 dB/oct slope. Fully passive — no power required. A trigger pulse drives the natural decay behaviour of the opto couplers, producing the classic bongo-like envelope response.

Sallen-Key 2-pole resonant lowpass filter with a pure vacuum-tube signal path using a 17JK8 dual triode. Cutoff and resonance are controllable via panel potentiometers and CV inputs. Cutoff CV accepts 0–3 V and roughly follows Hz/V standard.

6HP Eurorack audio color and textural processing effect comprising a chain of five stages in series: Drive, Filter, Tape Saturation, LoFi, and Compressor. CV inputs for the first four effects. Mono audio in and out.

Granular audio processor that creates textures and soundscapes by playing back layered, delayed, transposed and enveloped fragments of sound (grains) taken continuously from the incoming audio signal.

Full-blown modal synthesis voice with three exciter generators (BOW, BLOW, STRIKE) feeding a resonator that models vibrating structures such as plates, strings, bars, tubes, and bowls.

Two-channel, general-purpose trigger processor: translates incoming triggers or gates into envelopes, synchronized periodic modulations (LFO and tap-LFO), or drum signals.

Macro-oscillator with 16 synthesis models, internal LPG/envelope, and per-model tone controls (HARMONICS, TIMBRE, MORPH).

A resonator module that transforms an external, unpitched excitation audio signal into a full-bodied pitched sound, implementing modal synthesis, sympathetic strings, and extended Karplus-Strong string resonation.

Segment generator with flexible input/output layout. Each of 6 segments can be independently configured as ramp, hold, or step, and grouped via gate jack detection to form complex multi-segment envelopes, LFOs, step sequences, and more.

Dual voltage-controlled filter and amplifier (VCFA) with multiple dynamics manipulation modes including envelope generation, vactrol emulation, envelope following, and compression.

Digital tidal modulator — a function generator with three ramp modes (AD envelope, looping LFO/VCO, AR envelope), four output modes, and a wide palette of waveshapes with shape, slope, and smoothness controls.

A cross-modulation meta-modulator that blends and combines two audio signals using a variety of algorithms (crossfade, wavefolding, ring modulation, XOR, vocoder, and more), with an internal digital oscillator that can replace the external carrier signal.

Dual Analog 18dB resonant filter module inspired by Rob Hordijk's TwinPeak design. Morphs from lowpass to twin-peak bandpass; voltage-controlled resonance, FM, crossfader, and output VCA.

ADSR-controlled stereo VCA and resonant multimode-filter gate with a bypassable stereo chorus. The Blend control fades between a pure VCA and a VCA/filter combo behaving like a traditional lowpass gate, with lowpass, bandpass, and highpass filter settings. The ADSR envelope is fully voltage-controllable with a dynamic curve control.

Complex digital oscillator with interpretations of three classic synthesis algorithms (VOSIM, summation synthesis, and phase modulation), parameterized by four tone and two pitch controls.

XY step sequencer optimized for live use with four individually editable CV outputs and a trigger out. Steps can be manually programmed or live-recorded via encoder. Supports up to 16 saveable patterns, undo, zero, and shred functions.

Resonant low-pass gate with variable filter slope, RC envelope generator, and slew. Sequel to Sinclastic Empulatrix, replacing the clamping VCA with a resonant low-pass VCF and VCA combo.

Fully discrete 4-pole transistor ladder LPF (based on E-mu Modular 2100) and an all-transistor vintage-style VCA with variable CV response curve, pre-filter saturation, and selectable AC/DC coupling via rear DIP switches.

Semi-random melody sequencer/generator that outputs gate and 1V/oct pitch. Eight tunable parameters set the mood of the generated sequence.

Rhythmi is a Eurorack drum sequencer that allows you to dial in your groove, and explore it by evolving the pattern and modulating the energy. It allows for rhythmic inspiration and creativity without the burden of step programming.

All-analog variable response lowpass gate with resonant lowpass filter, VCA, and lowpass gate modes. Uses a Sallen-Key topology for a smooth two-pole filter that self-oscillates at high resonance. Features a tunable dynamics response circuit that replaces the traditional vactrol with a modern analog design.

Experimental time-based audio processor for the eurorack system. Stretches, bends and inverts time through granular synthesis, modified sample playback and tapped delay lines. Intended as a tool for adding synthetic and unnatural ambiance/coloration to synth patches.

An experimental eurorack reverb featuring three original artificial reverberation algorithms (HALL, FRAME, GRAIN) with post-reverb processing via AM, TXT functions, stereo I/O with a mono sum output, and CV control over most parameters.

Four analog bandpass filters in parallel, plus a control voltage processor to articulate vowel-like tones from your audio input.

Stereo Morphing Z-Plane Filter with 289 filter Cubes, each composed of up to 8 complex frequency response configurations interpolated in three dimensions (Frequency, Morph, Transform) via real-time CV control.

Mutating Spectral Resynthesizer that analyzes the spectral content of any audio signal and uses that analysis to drive a bank of from 1 to 33 oscillators, capable of accurately reproducing the input spectrum in real time or modifying it in creative ways.

Four-channel polyphonic quantizer and harmonizer with integrated keyboard, 8 harmonic progressions, microtuning, arpeggiator, and three assignable inputs and outputs. Memorizes up to 320 scales.

4-voice sample player and audio processor. Plays .wav files from microSD card organized into kits, with up to 12 layers per voice, per-voice effects (pitch, bits, filter, freeze, drive), master compressor and tape effects, 4 gate inputs, 4 assignable CV inputs, and MIDI input.

12dB/octave state variable multi-mode filter in 4HP with simultaneous LP, BP, and HP outputs, voltage-controllable cutoff and resonance, 1V/oct tracking, and a PING input that generates a fast-decay vactrol-like envelope without a vactrol.

Quad Multi-Mode VCF featuring two identical dual-peak filter channels with single (POLE) and dual-peak (DIPOLE) outputs per channel, plus a combined quad-peak mono DIPOLE AB output. Each channel has HP/BP/LP mode selection, DRIVE, FREQ, SPREAD, and RESONANCE controls with serial/parallel routing between POLE and DIPOLE stages. Stereo CV inputs allow simultaneous control of all four filter cores.

Faithful re-creation of the classic Oberheim SEM 12dB/oct state-variable filter with individual LP, BP, Notch, and HP outputs, a voltage-controlled Morph output, and voltage-controlled resonance. Built from period components including LM301, LM741, RC4558, CA3080-class OTAs, and discrete JFET current buffers.

Discrete OTA voltage-controlled lowpass filter with three simultaneous slope outputs (2-pole/12dB, 3-pole/18dB, 4-pole/24dB), voltage-controlled resonance, and input Drive control. Inspired by SSM2040 topology.

Stereo audio effects processor operating at 24-bit 48kSPS with algorithms including delays, frequency shifts, phasing, flanging, filters, reverberation, looping, sampling and frequency domain manipulation. Features CV control of real-time parameters and a graphic user interface for Eurorack and outboard use.

Dual voltage controlled filter (inspired by the Korg MS-20 OTA filter) with an innovative modulation matrix. Contains two dedicated filter circuits in series: a 12dB/oct low-pass filter and a 6dB/oct high-pass filter, both OTA-based. Features CV control over input gain and resonance, a link switch for band-pass configurations, and a modulation matrix for internal patching.

8HP 4-pole 24dB/oct low-pass VCF with a discrete core modeled on the SSM2040 chip (used in the Prophet 5 Rev 2). Features a configurable audio VCA (input or output), VC resonance, FM input with VC-FM index, and self-oscillation capability as a sine-wave VCO.

12-band fixed filter bank on the Bark psychoacoustic scale with 6th-order bandpass filters, per-band envelope followers, individual band outputs, and a voltage-controlled mixer with center/width/tilt scanning controls.

Analog utilities with creative mixing and patch surveillance. Combines classic analog computing elements including audio mixing, crossfade/pan, logical comparisons, envelope following, wavefolder, and offset. SURVEY provides meta-control over all functions.

Six correlated slope generators with shared parameters. Configurable as AR/ASR/ARSR envelopes, quadrature and tempo-synced LFOs, polyrhythmic clocks, PWM gates, VCOs, staircase waveform generator, slew limiter, and more via mode and range switches.

THREE SISTERS links three filters (LOW, CENTRE, HIGH) for building spectral spaces. The three filters can be configured as lowpass, crossover, and highpass (crossover mode) or three bandpass filters (formant mode). Signals can be patched into individual filters or all three simultaneously, and outputs can be taken individually or as a mix.

A variable-width bandpass filter with fast and tactile controls. Features an 8-pole filter core (cascaded 4-pole HP and 4-pole LP), independent resonance and self-oscillation per side, feedback circuit, input level VCA, and dry/wet mix for parallel filtering.

4/2-pole state-variable filter with input saturation, output wavefolding, simultaneous 2-pole HP/BP/LP outputs, and a switchable 4-pole output (HP/LP/BP). Includes a ping circuit emulating vactrol response and temperature-compensated V/Oct tracking.

Digital destruction Eurorack module with CV control over every parameter. Features 252 wave tables for extreme sound manipulation, variable sample rate (CD quality to 280Hz), and bit depth control (8-bit to 1-bit). Includes gain/tone preamp, direct input bypass, and tone enable/disable switch. Fully DC coupled for audio and CV signals.

WMD Performance Mixer: 8-channel live performance mixer with 6 mono channels (12 inputs), 2 true stereo channels, CUE/PFL monitoring, 2 aux sends, stereo send/return, unity gain mix inputs, and dual headphone outputs.

Dual peak multimode state variable filter with two analog filter cores, 10 distinct frequency responses, voltage control over resonance and peaks balance, nonlinear feedback and cross-modulation, and adjustable input overdrive. Model of 1976.

Triple summing mixer featuring three signal-adding sections, with the middle one optionally fed to the top and bottom ones. Compact utility module useful in summing multiple stereo and mono sound sources (up to four signals for each section). DC-coupled signal path with soft clipping circuits and color signal level indication.

Dual discrete-core voltage controlled amplifier with overdrive. Each of two independent channels features simultaneous linear and exponential CV inputs, a volume knob ranging from -80 dB to +18 dB, a soft-clip circuit, and a switchable overdrive offering two tube-amplifier distortion responses. DC-coupled signal path supports CV processing.

Stereo voltage-controlled multi-effect signal processor based on the Spin Semiconductor FV-1 DSP chip, with two adjustable audio inputs, two outputs, stereo voltage-controlled wet/dry mixer, OLED screen, microSD card slot for loading effect programs, and up to three voltage-controlled parameters per effect.

Warna II is a voltage distributor utility module with five normalled sections: two 1:4 buffered multiples, two voltage inverters (hardwired to the mults), and a unity-gain 4:1 summing mixer normalled to both multiples. DC-coupled and unity-gain throughout; suitable for CV and audio.