Modular
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Penrose is a very nice CV quantizer DIY kit for the Eurorack format. It takes an incoming continuous CV voltage and converts it to the nearest note in a scale. Active notes can be selected with the 12 buttons. You can use it to tune the output of your analog sequencer, as a semi random melody generator, for fast chiptune arpeggios and much more.It comes as a complete kit with all needed parts to build it. That includes an aluminum frontpanel, high quality jacks and illuminated bi-color push buttons. The project is open source, so the schematic and source code is available.DIY-Kit-Type:THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. please check the buttons below.
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Presenting timeless waveforms including Sine, Triangle, Pulse and 3 Sub-Octaves this oscillator emerges as an exceptionally stable, precise, and awe-inspiring sonic source. Its brilliance truly emerges when engaged in frequency modulation.Features• Classic Analog VCO• 4 Outputs: SINE, TRIANGLE, PULSE, SUB• Oscillation from supersonic to sub-audible (LFO)• 1V/Octave tracking• Pulse Width Modulation with Attenuator• Linear Frequency Modulation with Attenuator• Exponential Frequency Modulation with Attenuator• Integrated Frequency Divider• Up to 3 Sub-octaves• Attenuator for each Sub-octave• Wrong Polarity ProtectionDIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
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Meet Dirty Dan, the eurorack rebel who doesn't play by the rules of clean and tidy. Dan's all about embracing the mess, dishing out gritty goodness, and making those pristine waveforms second-guess their existence. If your sound needs a touch of snotty charm, Dan's your man. Just remember, he's not just dirty – he's delightfully disruptive!Features• Vactrol-Based Analog Filter• Three Channels• Separate Distortion Stage• High Pass and Low Pass• Cutoff controls High Pass and Low Pass• Two Clipping Modes• Feedback Control• Skiff Friendly• Wrong Polarity ProtectionDIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
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GIVE V2 is a sonic powerhouse that transcends the boundaries of traditional sound generation. The module is an exceptional analog VCO accompanied by a versatile waveform mixer and three suboctaves.Features:• Classic Analog VCO• 5 Outputs: SAW, TRI, SUB, NOISE, PULSE• 1V/Octave tracking• Pulse Width Modulation with Attenuator• Frequency Modulation with Attenuator• Integrated Waveform Mixer• Skiff friendly design• Wrong Polarity ProtectionDIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
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Rocinante's Gate is not a classical low-pass gate (LPG) using vactrols, but goes way beyond that providing an adjustable envelope to control the "gate" through an analog filter. Sending a gate or trigger signal into the GATE INPUT will create these envelope shaped sounds you know from other LPGs.Features:• Low-Pass-Gate based on an Analog Filter• Internal Envelope Generator• Adjustable Rise, Decay, Length, Fall Stages• Internal LFO• Gate Level CV• Loop Mode• Re-Trigger Mode• Use the Envelope and LFO with External Modules• Skiff Friendly• Wrong Polarity ProtectionDIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
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Actually, it's a ST Modular's Franz'd Ripples, if you will. Like Franz, Werner is a filter with an internal mixer and LFO. Not as buttery as Franz, but still one of the best filters around.Features:• Analog Filter• 3 Filter Outputs: Low Pass 2-Pole, Low-Pass 4-Pole, Band Pass 2-Pole• VCA for Low-Pass 4-Pole• Internal LFO with three Waveforms: Triangle, Inverted Triangle & Square• LFO Reset, LED indicating LFO rate, LFO normalized to Filter Circuit• Apply three LFO waveforms at the same time• Attenuator for each LFO Wave or external CV• 3-Channel MOOG CP3 transistor based Mixer• Volume control for each Mixer Channel• Wrong Polarity ProtectionDIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
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Meet the Swiss Army Knife's ambitious cousin - the multitasking marvel that sits in front of your Eurorack, ready to unravel musical puzzles, slice through soundscapes, and twea-zor its way into your sonic heart.Features:• Multiple• LFO• Attenuator• Fader• Swap• USB-PowerDIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
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At its core, Boba Fat features two oscillators that empower producers to easily craft both earth-shaking sub-basses and delicate, enveloping kicks.Features:• Analog Drum Generator• Designed for Kick- and Bassdrums• Two Voices: Soft Mallet and Hard Mallet• Each Mallet may be triggered independently• Internal LFO with Sync• Volume and Boost per Voice• Groove CV Input „Vari“ for Hard Mallet• Mod CV Input for Soft MalletDIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
sold out at the moment
Horrorscape Synthesizer - sculpting feedback into sonic art!Audrey II is a horrorscape synthesizer designed for fearless exploration of feedback. Unpredictable yet compelling, it transforms chaotic sound into immersive soundscapes. From deep, haunting drones to screeching, otherworldly tones, Audrey II is a sonic beast like no other.Feedback Synthesis?What is feedback, really? It’s that magical moment when sound loops on itself, evolving into something wild. With Audrey II, we’re taking feedback to the next level using Karplus-Strong synthesis—a fancy term for turning short bursts of noise into rich, self-sustaining tones. Think digital strings, but way cooler.Digital WitchcraftSome say analog is the only way to get that sound… We were surprised too when we heard the first burst of noise coming through our headphones. That warmth, the grit, the unpredictability—it was all there. But here’s the twist: Audrey II is 100% digital, running on the almighty Daisy Seed platform.Built from the ground up to emulate analog chaos, digital bits power every nuance of Audrey II’s feedback, distortion, and reverb-drenched echoes. It’s pure digital magic that doesn’t just imitate analog—it embraces and amplifies it. What you hear isn’t just a close approximation; it’s a whole new breed of sound that pushes digital synthesis into uncharted territory.Pristine SoundPowered by the Daisy Seed microcontroller, Audrey II delivers 96kHz / 24-bit audio with the speed of an ARM Cortex-M7 at 480MHz. Equipped with 64MB of SDRAM, it handles complex feedback, drones, and effects seamlessly, pushing digital synthesis into rich, analog-like territory.The Signal Flow01. Karplus-Strong Synthesis & DistortionThe signal begins with Karplus-Strong synthesis, a method of string synthesis that creates resonant, droning tones—adding layers of harmonics to emulate organic vibrations, while feedback and distortion weave in raw, aggressive edges.02. ReverbNext, the signal passes through a rich, spacious reverb, allowing the drone and feedback to bloom, creating haunting and immersive atmospheres.03. FiltersFollowing the reverb, Audrey II utilizes high-pass and low-pass filters with a body control to shape the sound further, revealing hidden overtones and harmonic textures that can add either warmth or an eerie sharpness to the feedback.04. Tape Delay EmulationFinally, the signal reaches a tape delay emulator that further degrades and expands the sound, adding layers of movement, modulation, and a classic tape echo feel that’s both nostalgic and unpredictable.05. Stereo OutputTo top it all off, Audrey II’s stereo output widens the soundstage, creating a sense of depth and space that immerses you in rich, layered textures. With stereo feedback flowing through the chain, each element takes on new dimensions, allowing you to push the boundaries of sonic space.Driven & Open SourceAudrey II is a collaborative project born from the Synthux Academy community, where music technology enthusiasts, designers, and engineers come together to push creative boundaries. Developed by Nick Donadson from Infrasonic Audio and designed by Roey Tsemah, founder of Synthux Academy, Audrey II embodies the spirit of exploration and innovation that drives this community.Audrey II’s firmware is available on our GitHub, inviting anyone to dive into the code, make modifications, or build upon its foundation. This open-source approach empowers makers not only to experiment with Audrey II’s sound but to shape its future, contribute enhancements, and share discoveries with the Synthux Academy community. Audrey II is a testament to the creativity that can emerge from collective knowledge and a shared passion for instrument design.Features:• Karplus Strong synth engine• Reverb amount• Reverb size• High and low pass filters• Tape delay emulation• Stereo out• Built on the Daisy Seed• Open sourceDIY-Kit-Type:THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. please check the buttons below.
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Introducing Simple Designer: the ultimate rapid prototyping instrument for the synth community. Boasting 80 slots for potentiometers, switches, and jacks, plus the capability to incorporate faders and LEDs, it invites endless creativity. Whether you're building from the ground up or iterating on existing designs, Simple Designer, powered by the versatile Daisy Seed microcontroller, is your canvas for creating a full-blown synthesizer. Tailored for designers, makers, and musicians at any skill level, Simple Designer transforms your visionary concepts into tangible, sonic reality with unprecedented ease. Start crafting your masterpiece with Simple Designer today—where your synth dreams become reality.Features:• Programmable. All Simple kits come with the Daisy Seed microcontroller and access to our introduction to synth programming video course.• Open source instrument on Github.• Each kit comes with a video course teaching sound fundamentals: https://learn.synthux.academy/• Powerful music instrument for live performances.DIY-Kit-Type:SMD-Kit-2. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. It includes SMD and through-hole parts! For build guide, more info, videos etc. please check the buttons below.
sold out at the moment
Unleash your creativity with Simple Fix, the rapid prototyping tool designed for synth designers, makers, and musicians. Powered by Daisy Seed microcontroller, Teensy, or Arduino Nano, it's your quick-start solution to bring ideas to life. Effortlessly add knobs, switches, and jacks, and dive into the limitless world of sound and functionality. Whether you're a pro or a passionate hobbyist, Simple Fix accelerates your design process, transforming inspiration into reality faster than ever. Start your journey towards groundbreaking designs today and unlock your creative potential with Simple Fix—where your next masterpiece begins.Features:• Programmable. All Simple kits come with the Daisy Seed microcontroller and access to our introduction to synth programming video course.• Open source instrument on Github.• Each kit comes with a video course teaching sound fundamentals: https://learn.synthux.academy/• Fits in your pocket.DIY-Kit-Type:SMD-Kit-2. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. It includes SMD and through-hole parts! For build guide, more info, videos etc. please check the buttons below.
sold out at the moment
Discover Simple Touch, the go-to rapid prototyping instrument for synth enthusiasts, from designers to musicians. Featuring 12 touch pads, 6 potentiometers, two faders, and stereo input/output, all powered by the dynamic Daisy Seed microcontroller. Simple Touch is engineered to bring your sonic visions to life with precision and ease. Dive into a world where your fingertips command the future of sound, blending intuition with innovation. Ideal for both seasoned creators and passionate hobbyists, Simple Touch is your shortcut to prototype, experiment, and elevate your designs. Embrace the power of touch with Simple Touch, and transform your creative impulses into extraordinary musical inventions today.Features:• Programmable. All Simple kits come with the Daisy Seed microcontroller and access to our introduction to synth programming video course.• Open source instrument on Github.• Each kit comes with a video course teaching sound fundamentals: https://learn.synthux.academy/• Powerful music instrument for live performances.DIY-Kit-Type:SMD-Kit-2. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. It includes SMD and through-hole parts! For build guide, more info, videos etc. please check the buttons below.
sold out at the moment
Discover the Touch 2, an instrument designed for hands-on control and tactile interaction. Easily upload different instruments via USB and start playing instantly!Open source instruments included: BASS // STRING // LOOPER // FX // DRUMS // SLICERCheck out the product page for the complete instrument list, download links, and videos. https://www.synthux.academy/simple-synth/touch2Key Features:Swappable Faceplates: Includes 4 different faceplates for versatile performance.12 Touch Pads: Experience a responsive, tactile performance every time.Powered by the Daisy Seed microcontroller, the Touch 2 delivers incredible sound quality with any instrument you load onto it. Plus, it's fully programmable! Create your own unique instruments using C++, Arduino, Max, or Puredata.Upgrade your music-making experience with the Touch 2. Order now and elevate your performance!Features:• Programmable. All Simple kits come with the Daisy Seed microcontroller and access to our introduction to synth programming video course.• Open source instrument on Github.• Each kit comes with a video course teaching sound fundamentals: https://learn.synthux.academy/• Powerful music instrument for live performances.DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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The Threetom Modular Doppio is a compact stereo amplifier, drive, and soft limiter module. Doppio helps complex and dynamic stereo sounds to find their place in a modular synthesizer context, where signals are hot, and headroom is extremely limited. Doppio does this by implementing a compact, yet flexible, soft-knee limiter. The limiter is specifically designed for eurorack levels and avoids the need for unnecessary make-up gain, resulting in a lower noise floor.Doppio offers three different gain settings (x1, x5, x21), and three different ratios (linear, drive, and limit). In addition to this Doppio has gain and volume knobs for more precise control. Different combinations of these settings cater to applications like saturating complex stereo signals without turning them into mush, end-of-chain limiting, and boosting line level signals to eurorack level, while still retaining enough oomph to also saturate them nicely. Finding the right settings is made easy by DOPPIO’s unique coffee-bean-shaped indicator lights.Even though Doppio’s architecture is stereo, that doesn’t mean it has no uses on mono signals: Either process two mono signals with identical settings, or chain the two channels to form a two-stage high-gain mono drive. Finally, it’s important to note that Doppio is DC-coupled and can also be used to process CV signals.In summary: Doppio is to your signals what a double espresso is to you – it makes you bigger and bolder – and you know you’re hooked when the withdrawal symptoms kick in.Features:• Three different maximum levels of gain: x1 (0dB), x5 (+14dB) and x21 (+26dB)• Three different soft-clipping modes: Drive mode, Off / linear mode and Limit mode• Caffeine knob for fine control over the gain applied to the inputs• Volume control for post-gain attenuation• Coffee-bean-shaped indicator lights make finding the desired settings easy• Reverse power protection• 4-layer PCB design with completely separate of audio supply rails and groundDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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The Threetom Modular “Mixing Flask” is a utility mixer offering mix-bus limiting and a cornucopia of indicator lights integrated behind a unique chemical lab-inspired front panel.I designed Mixing Flask as a solution to my main three gripes with conventional utility mixers:• Mixing too hot is too easy, leading to hard clipping on the mix-bus. And even when there’s an indicator light to warn you when this is happening, there are no features to actively prevent it.• Utility mixers usually only offer unity gain, so when you have a weak input signal (like a MTM Radio Music), you’re out of luck• They’re nauseatingly boringMIXING FLASK provides solutions to these annoyances in the following ways:• I’ve implemented a soft-clipping limiting circuit on the mix-bus (inspired by DOPPIO). The highest setting prevents the mix-bus from hard clipping altogether in favor of warm saturation.• All inputs have a gain of +6dB allowing you to better equalize between volumes while maintaining a hot mix-bus output• The myriad of indicator lights and front-panel graphics make you feel like a mad scientist in your modular chemical lab. I bet you won’t find another utility mixer that makes mixing more exciting than Mixing Flask!Use cases:• Mix oscillator waveforms without the risk of hard-clipping• Mix CV signals while keeping an eye on what’s coming in and going out• Give a gentle boost to weak input signals (e.g. from a sampler module)• Have a utility mixer in your case that’s interesting to look at, and doesn’t bore you to death!Features:• Three different flavors of saturation on the mix output (hard clipping, soft/hard clipping, or soft-limiting)• Three inputs with up to +6dB of gain, and bipolar monitor lights• One mix output with three-stage bipolar monitor lights (signal present, signal nominal, hard-clipping warning)• Backlit chemical-lab-inspired front-panel graphicsDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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The MS-22 is a dual voltage controlled filter, inspired by the classic Korg MS-20 filter, with an innovative modulation matrix and one of the highest function-to-hp ratios in the land of Eurorack. This module was inspired by many pleasant chats with tech journalist Steve O’Hear. Head over here for a full product description and demos.The MS-22 contains two dedicated filter circuits, one low-pass and the other a high-pass. These are configured in series, the low-pass going into the high-pass. This configuration allows for a unique duophonic fighting resonance behaviour (see this demo video). The cutoff frequencies of both filters can be CV’ed. Compared to most bread-and-butter MS-20 clones, the MS-22 is twice the amount of filter condensed down into half the package (4HP).Features:• Dual VCF inspired by the Korg MS-20 OTA filter• Low-pass into high-pass configuration• Innovative modulation matrix allows CV control over all parameters• Cut-off frequencies can be linked, resulting in a band pass filter with controllable bandwidth• Bipolar monitoring LEDs for the LP, HP, resonance and gain CV signals• One of the best functionality-to-size ratios in Eurorack with a width of 4 HP and a depth of 45 mmDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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As someone who is developing Eurorack modules, I always found it tedious to visualize signals coming from the modular synth on my oscilloscope. The reason for this is that there’s really no convenient adapters for this (well, as far as I know at least). Most workarounds to this problem suffer from two problems: a) They’re usually mechanically unstable, and b) most of the times I would need to redistribute the visualized signal to somewhere else, which requires extra cables and a mult. To alleviate these issues I’ve created the the THREETOM Wiretap, a 2-way mult that you can directly mount onto a BNC connector.This is a fully assembled Wiretap adapter, no assembly required, just plug and play!
sold out at the moment
The 3394 Voice is a compact and flexible analog synth voice that packs a full signal chain into one module.VCO, VCF, VCA, envelopes, and noise. Based on the classic 3394 chip, it delivers rich analog tone with selectable square, saw, and triangle waveforms, routed through a juicy 24dB low-pass filter capable of self-resonance and pitch tracking. Two built-in envelopes shape both filter and amplitude, with switchable AD/AR modes for dynamic control. When unpatched, it acts as a constant VCO output, and the mix trimmer allows tonal variation by blending in a square sub, noise, or external signal. Ideal for melodic lines or snappy percussive sounds like kicks, snares, and zaps, the 3394 Voice is both a complete voice and a set of standalone building blocks for your Eurorack system.Features:• VCO with Triangle/Square/Saw waves• Lowpass resonant 24db filter• Square sub oscillator• Analog noise source• Built in VCA and 2 envelopes• Can also be used as separate Filter/VCO/VCA/Noise sourceDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
sold out at the moment
The Automator is a hands-on, 2-channel tempo-synced CV and gate recorder for Eurorack, built around a large, expressive slider and intuitive controls. It captures your movements in real time, turning gestures into looping modulation patterns with precise timing. Requiring an external clock (4ppqn), Automator continuously records while idle and begins playback the moment you hit record, looping up to 4 bars. You can change loop length and tempo post-recording, and each channel—selectable via a button—is color-coded (red for channel 1, green for channel 2). CV is recorded via the slider, while gates are captured using a dedicated button, with high resolution and flexible timing. Whether you're drawing dynamic modulations or tight rhythmic triggers, Automator gives you a powerful and performative way to animate your patches.Features:• Dual-channel CV and Gate recorder with tempo sync• Dedicated Gate button for rhythmic trigger input• Supports loop lengths from ¼ bar to 4 bars• Channel selection button with color indication (Red = Ch1, Green = Ch2)• Real-time recording resolution (CV every 2ms, gates down to 50ms)• High gate density (up to 125 triggers per bar)• Recordings timestamped for accurate playback timing• Decoupled gate and CV recording for flexible pattern creation• Clock input (4 ppqn) with tempo scaling from 30 BPM upwards• Playback length can be changed after recording without losing dataDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
sold out at the moment
The FMP is an 8 HP Eurorack FM synthesizer module built around the classic Yamaha YM2413 chip, known for its distinctive sound in vintage game consoles like the MSX, Atari, and Sega systems. Capable of producing everything from clean tones, deep kicks, and noisy snares to bell-like textures and even polyphonic chords, the FMP offers two modes: Tone mode provides a 2-operator FM voice with self-modulating feedback, while Drum mode exposes the chip’s built-in percussion sounds with adjustable levels and pitch. Seven parameters shape the sound and CV interpolation between two parameter sets enables evolving, expressive patterns. While inherently lo-fi, the FMP embraces this character to deliver dynamic, gritty textures, with settings that can be saved for consistent recall. Its charm lies in the unpredictability, offering a rich playground.Features:• 8 HP FM synth voice based on Yamaha YM2413 chip• Two modes: Tone (2-operator FM synth) & Drum (built-in percussion sounds)• Wide sonic range: kicks, snares, hats, bells, chords, and more• Seven tweakable FM parameters• Save and recall settings on power-up• Characterful lo-fi sound with modulator feedback• Adjustable pitch and mix levels in Drum mode• Inspired by classic game console sound chips (MSX, Sega, Atari)DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.