Products of CubuSynth
CubuSynth was founded by Ruben Sponar in 2020 and is based in the south of Portugal. The company develops Eurorack modules, a modular synthesiser format.
Ruben, a musician and audio engineer, is responsible for every stage of the process – from PCB layout and design, manual assembly and calibration, to writing manuals, maintaining the website, and personally handling customer support. He is supported by his wife and “partner in crime”, Joana Gregório, who manages content creation, marketing, administration, invoicing, as well as the preparation and shipping of orders.
CubuSynth is a small company driven by passion and dedication. Every detail is carefully taken care of so that each module arrives ready to inspire and nurture the musical creativity of modular synthesis enthusiasts.
CubuSynth - 4Decay
available
The CubuSynth 4Decay offers 4 envelopes for percussive and plucky sounds. The gate inputs are normalized to the jack below, which lets you use the same gate signal for 2, 3 or all 4 channels at the same time.Features:• 4 channel Decay envelope• Normalized Gate inputs• 1ms to 2 second Decay time• LED per channel to indicate Output voltage• Output at 5V maxDIY-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.
€67.00*
CubuSynth - 4Mix
available
One of the most necessary modules for Eurorack, the CubuSynth 4Mix is a 4 channel mixer that can be used for audio or CV signals. It features a normal and a phase-inverted output.Features:• 4 channel Mixer• Usable for CV and Audio signals• Normal & Phase inverted Outputs• high input impedance• Reverse Power protectionDIY-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.
€64.00*
CubuSynth - 4TRG
available
The CubuSynth 4TRG has 4 independent Random Gate skippers with probability knob per channel. The First channel can turn into a Clock generator when no cable is inserted into the Gate input. The Output is then Normalized to the other channels (2-4).It can also create “ratcheting” gates, when the Gate input on channel 1 goes to 2,5V instead of the normal 5V. The knob will then determine the Ratcheting speed.Features:• 4 channel Probability Gate Skipper• Normalized Gate inputs• Probability knob per channel• First channel turns into clock generator when no gate is present• Outputs 5V Gate signalsDIY-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.
€74.00*
CubuSynth - 4VCA
available
You can never have too many VCAs! This is why we packed 4 of them into only 4 HP. Modulate the Amplitude of Audio signals or the Modulation strength of CV.The CV inputs are normalized to the input below, which lets you use the same control voltage for more channels simultaneously. Any output (channels 1-3) that stays unconnected, will be mixed into the output of channel 4.Features:• 4 channel Audio / CV VCA• Normalized CV inputs• high input impedance• Versatile Unity Gain Mix Output• Full volume with 5V CV input / Accepts CV input up to 12V (~2.5x Gain)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.
€67.00*
CubuSynth - 6xLevel
available
The CubuSynth 6xLevel module is a 8 HP passive attenuator, which allows scaling of CV and audio signals. The inputs are normalized from the outputs above, which allows passive multiplication with attenuation. The normalized path is attenuated by the potentiometer before, so you can also create very subtle changes (e.g. Fine tune a VCO). The silver lines on the front panel mark the normalisation routing.Note, that it is a passive module, for multiplying non-precise voltages. It is recommended to not use more than 3 outputs from the same input.Features:• 6 individual attenuators• flexible passive multiple (1x6, 2x3, 3x2, 1x4 + 1x2)• normalized inputs from output aboveDIY-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.
€41.00*
CubuSynth - ADSR
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The CubuSynth ADSR is a very versatile envelope generator. It features linear or exponential curves, TIME CV which shortens the overall time of the whole envelope, different mode settings, Level CV (saves an extra VCA) and normal (0V to +5V) and inverted (0V to -5V) Outputs.The TIME CV makes an excellent modulation input for either envelope modulation or LFO frequency modulation. It also has a PUNCH switch which holds the maximum level for a few milliseconds before starting the Decay stage. This is very useful for adding extra punch to short percussive envelopes.Features:• GATE and TRIGGER inputs for retriggering• MODE switch that allows selection of normal ADSR, Gated looping, or full LFO-style Looping mode• LEVEL CV for additional Volume control / Velocity input (Volume on 100% when nothing plugged in)• TIME CV for very dynamic modulations• Switch for linear or exponential mode• Two Outputs (normal 0V to +5V and inverted 0V to -5V)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.
€81.00*
New
CubuSynth - Arkarion
available
The ARKARION is a full-featured analog synthesizer voice in Eurorack format, designed for creative exploration and dynamic signal flow. Combining the warmth of analog circuitry with a digitally controlled internal routing system, ARKARION offers a unique blend of structure and unpredictability. It's an expressive, performance-ready instrument for musicians seeking deep modulation, generative possibilities, and hands-on control.At the core of ARKARION lies a digitally interpreted “DNA patch system” — a signal-routing framework inspired by genetic code. This system unlocks over 65,000 modulation and audio paths, allowing for rich, morphing textures that evolve at the press of a button or incoming gate.Features:• Complete analog synthesizer voice with digital routing control• 2 analog VCOs with selectable waveforms• MIDI input with pitch CV and gate outputs• Envelope generator with rise/fall stages, loop and gated loop modes• 2 CV-controllable LFOs for versatile modulation• Gate-triggered random voltage source• Multimode filter: lowpass, bandpass, highpass, allpass (switchable)• Tape-style analog delay with CV control• Digitally controlled “Gene Modification” knob for live routing mutation• 16-bit routing architecture: 65,536 possible patch configurations• 64 patch memory slots (8 banks of 8 presets)• Internal VCAs for modulation depth control• Randomize routing via button or external gate input• LED indicators visualize current patch structure and modulation pathsDIY-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.
€450.00*
CubuSynth - Dual CS-20 VCF
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The CubuSynth Dual CS-20 VCF is a versatile module that combines two 12db filter cores in a dual/stereo configuration. It is inspired by the iconic Korg MS-20 synthesizer, offering similar sound characteristics while the resonance can be pushed even further.The module provides multiple filter modes, including low pass and high pass, which can be blended together to create a diverse range of filter responses. This allows you to shape your audio signal in various ways, from smooth and warm low pass filtering to more aggressive high pass filtering.One of the standout features of the CS-20 VCF is its self-oscillating resonance capability. When the resonance is turned up, the filter produces a sine wave that can be used as an additional sound source. This feature adds to the versatility of the module, allowing you to create complex and evolving sounds and even cross-FM modulation possibilities.The frequency and resonance parameters can be controlled via control voltage (CV) inputs. The frequency CV input can be attenuverted, meaning it can both attenuate and invert the incoming CV signal. This gives you precise control over the modulation depth and direction for frequency modulation.The resonance CV input includes an attenuator, allowing you to adjust the modulation depth for the resonance parameter. This feature gives you the flexibility to add dynamic and expressive modulation to your sounds.Additionally, the CS-20 VCF provides a 1V/Oct input, which allows you to control the filter's frequency using a standard 1V/Oct control voltage. This input is stable over a range of at least 2 to 3 octaves, ensuring melodic tracking and integration with other modular synthesizer components.Overall, the CubuSynth Dual CS-20 VCF offers a powerful and flexible filtering solution with intuitive routing and modulation options. It is designed to inspire creativity and provide a wide range of sonic possibilities for your modular synthesizer setup.Features:• 2 individual Filter cores with common Frequency and Resonance controls• CV control over Frequency and Resonance for each Filter core• Self-oscillating Resonance with LED feedback circuit (visible on the Front)• 1 V/oct input, tracking over 2~3 octaves• Frequency Range: 22 Hz - 20 kHz• Blend between LP / HP Filter modes• Ability to use as 2 pole (12db) stereo HP/LP Filter, 4 pole (24db) mono LP/HP or a Band Pass (12db) Filter• Cross FM Modulation possibleDIY-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.
€140.00*
CubuSynth - Dual Vintage VCA
available
The CubuSynth Dual Vintage VCA is a nice sounding, zero bleed, analog Voltage controlled amplifier based on the LM13700 chip.It can work as two independent VCAs or as a stereo unit, and CV input 1 on channel 1 is normalized to the CV input 1 on channel 2. (same signal can control both channels).Features:• LEVEL Knobs set the Amplitude for each channel• CV AMOUNT Attenuators for the Control voltage from CV input 1• Second CV input per channel, without attenuatorDIY-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.
€58.00*
CubuSynth - Engine v2
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The CubuSynth Engine is a dual analog VCO with wave shaping functions, internal modulations and a chaos generator. It is based around the 3340 chip and features 4 Waveforms + Wavefolder per VCO and 4 Modulated Outputs, all simultaneously.The CubuSynth Engine can work as 2 independent VCOs, or as one complex FM oscillator. With its inernal "Chaos Engine" it creates semi-random voltages, generated by the 2 oscillator cores. This signal is then normalized to the CV inputs for Pulse width modulation and exponential FM. Each of the 2 VCOs offers a switch to select one of the 4 waveshapes to be used by thewavefolders, and the linear FM input normalisations.Features:• 2 VCO cores (voices)• 4 simultaneous wave forms per voice + 4 Modulation Outputs• Wavefolder per voice• Pulse Width modulation• Linear and exponential FM inputs• 1 V/oct tracking stable over up to 10 octaves• Chaos generator with external clock input• Complex internal normalized modulationsDIY-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.
€269.00*
CubuSynth - Exhaust v2
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The Exhaust adds many features to your Engine VCO module like Sub-octaves, Mixing and a Gate generated by the Chaos signal.You can select one of the two VCO cores of the engine to produce square waves one and two octaves below the oscillators frequency. You can blend between -1 and -2 octaves and set the volume they are mixed into the main “Mix” output.The knobs “VCO1” “VCO2” and “AM” set the level of the selected waveform of each VCO and the AM output from the Engine to the main mix. The “Ext In” input is normalled from the RM output, but you can plug in any other signal to go to the main mix. The V Ref sets a Voltage between 0V and +10V which compares against the chaos signal from the Engine (Chaos attenuator on the Engine doesn't matter). Whenever the chaos signal is higher in voltage than the knob setting, it will give you a gate or trigger signal depending on the switch. There is also a CV input, which offsets your V Ref and can create interesting rhythms.Features:• Two sub-ocatve generator with selection switch, mix knob for -1 and -2 octaves (/2 and /4)• 5 channel audio mixer for 4 different outputs from the Engine and the sub-octave generator• External input for mixing with other signals• Semi-random gate or trigger output generated by the chaos signal• Audio-optimized chaos output• Separate outputs for sub-octave and main mixDIY-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.
€95.00*
CubuSynth - QuadVCLFO
available
The 4VCLFO is four LFOs with triangle outputs in 10 HP. It features a knob for the frequency of each LFO and CV inputs with attenuators. The „Aux“ input is normalized to the four CV inputs, so you can modulate all LFOs with one signal at the same time. Plugging a cable into the CV input breaks its connection from the aux input. This way you can create more interesting Modulations for your Patches.Features:• 4 independent Triangle wave LFOs• CV input with attenuator for each LFO• „Aux“ input normalized to the CV inputs• Eye-catching display for indication of polarityDIY-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.
€87.00*
CubuSynth - VCFA
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The CubuSynth VCFA is a multimode VCF with LP,HP and BP modes with integrated VCA, CV control over frequency, resonance and volume. The CV input for the frequency features 1V/Oct scaling over about 2~3 octaves. So you can even create plucky melodies with the resonance in "ringing" mode. The gain control can reach a nice, soft saturation.Features:• 3 simultaneous Outputs for Low Pass, Band Pass and High Pass• Integrated VCA at the input stage• CV control over volume, frequency and resonance• "Ringing" mode on upper resonance setting• 1 V/oct tracking over 2~3 octaves (with freq CV attenuator on 100%)• Saturation on incoming signal (VCA stage) on upper gain settingDIY-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.
€87.00*
CubuSynth - VCLFO v2
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The CubuSynth VCLFO v2 is a Digital Voltage controlled Low frequency oscillator, with 16 Waveforms, Step control (Sample & Hold style), LFO Sync / Reset, CV control over Frequency, Amplitude, Waveform, Frequency multiplier, Skew and Step Rate.It is based on the Electric Druid VCLFO10 chip which was written/designed by Tom Wiltshire aka "Electric Druid".Features:• 16 Waveforms selectable in two Banks of 8• Frequency range: 0.05Hz to 12.8Hz (102.4Hz with multiplier x8)• 6 CV inputs for Multiplier, Frequency, Step Rate, Skew, Waveform and Level• "Sync" Input for LFO reset, or Step Sync• 3 outputs: Uni-Polar (0 to +5V), Bi-Polar inverted (+5V to -5V / 10Vpp) and Bi-Polar normal (-5V to +5V / 10Vpp)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.
€140.00*