This is an introduction and overview of the Trivium by Weston Precision Audio, available at Takazudo Modular.
The Trivium is an analog multifunction module born from a collaboration between Weston Precision Audio and performance artist Trovarsi. It packs a discrete OTA state variable VCF, a VCA with overdrive, dual envelope generators (ADSR + AD/AR), and flexible routing switches into a compact 12HP form factor. With its shallow 26mm depth, it fits even the shallowest Eurorack cases, making it ideal for portable performance setups.
This product is available for purchase below.
Takazudo Modular publishes manuals and related documents with Japanese translations. See the links below.
- Discrete OTA State Variable Filter
- VCA with Overdrive
- Dual Envelopes
- Routing Flexibility
- Compact Performance Design
- My Impressions
- Related Takazudo Modular Products
- Reference Videos
- Specifications
- Included Items
Discrete OTA State Variable Filter
The Trivium’s filter section features a discrete OTA (Operational Transconductance Amplifier) state variable VCF. A front panel switch selects between LP (low pass), BP (band pass), and HP (high pass) modes. The filter has a clean yet warm sound character, and it self-oscillates at high resonance settings. In LP mode, self-oscillation produces a pure sine wave at approximately 5V peak-to-peak.
V/Oct tracking covers 4 to 5 octaves, making it suitable for creating pitched filter sounds. Both Cutoff and Resonance have dedicated CV inputs. The Filter Env attenuverter provides precise control over envelope-to-filter modulation depth: center position is zero, clockwise goes to +100%, and counter-clockwise reaches -100% (inverted).
VCA with Overdrive
The Trivium’s VCA section features a Gain control. The center-detented position provides unity gain, and turning clockwise pushes up to +7dB of overdrive. In the overdrive region, soft clipping produces natural-sounding distortion.
The Pre/Post switch changes the signal path order between the VCA and filter. In Pre mode (VCA before filter), the VCA’s discrete transistor topology drives the filter with analog saturation, creating more aggressive sounds. In Post mode (VCA after filter), the signal flow follows a standard subtractive synth architecture.
Dual Envelopes
The Trivium features two independent envelope generators, both triggered by a single Gate input.
The ADSR envelope is a traditional four-stage envelope with logarithmic curves. Attack time ranges from 1ms to 7s, and Decay/Release times range from 2ms to 7s. Dedicated CV inputs for Decay and Release allow external modulation of time parameters.
The AD/AR envelope has a pseudo-exponential (slightly convex) attack curve. A front panel button toggles between AD mode (a complete two-stage envelope triggered by gate) and AR mode (a rise-hold-release envelope that follows gate length). Attack time ranges from 1ms to 7s, and Decay/Release times range from 2ms to 7s. Dedicated CV inputs are provided for Attack and Dec/Rel parameters.
Both envelopes output at 8V and feature direct output jacks. This allows them to be used not only for controlling the Trivium’s internal VCF/VCA but also as modulation sources for other modules in your system.
Routing Flexibility
One of the Trivium’s most distinctive features is its four front panel routing switches that provide extensive signal flow configuration.
- Pre/Post: Places the VCA before or after the filter
- VCA CV: Selects the VCA control source from ADSR, AD/AR, or HOLD (VCA stays open)
- VCF CV: Selects the filter cutoff modulation source from ADSR or AD/AR (through the attenuverter)
- Filter Type: Switches between LP, BP, and HP
Additionally, the VCA Env input allows dynamic VCA modulation from external CV sources.
This routing flexibility enables the Trivium to serve as a subtractive synth voice, percussion/kick drum generator, modulation source, audio processor, and much more.
Compact Performance Design
The Trivium measures 12HP wide with a shallow 26mm depth. With no protruding power connector, it fits the shallowest Eurorack cases on the market. Power is internally rectified, allowing safe cable installation regardless of ribbon cable orientation (built-in polarity protection). This module was designed from the ground up for portable performance setups.
My Impressions
The Trivium’s core concept is “Bring Your Own Oscillator” — connect any sound source you like, whether it’s a VCO, complex oscillator, field recording, or anything else. Everything beyond the oscillator stage is packed into this single module, so as long as you have something that can serve as an oscillator, the Trivium turns it into a full synth voice all on its own.
The Pre/Post routing switch deserves particular attention. Setting it to Pre lets you drive the filter with the VCA’s discrete transistor saturation, which creates a unique character. It’s also excellent for acid-style sounds — the combination of a resonant filter with fast envelopes is right in its element.
The fact that both envelopes have direct outputs is a welcome bonus. Beyond controlling the Trivium’s internal VCF/VCA, they can serve as modulation sources for external modules — so even if you’re not using the Trivium as a synth voice, there are still countless ways to put it to use.
Related products include the Weston Precision Audio SE1 Shaped VC Envelope (envelope generator) and SF1 State Variable Filter (filter). The Trivium can be thought of as integrating similar functions from these modules into a single unit. While the B2 Kick is a synth voice geared toward kick drums with a built-in oscillator, the Trivium is better suited for more diverse and flexible setups.
This is a module that sparks your imagination about what to pair it with!
Related Takazudo Modular Products
Analog ADSR envelope generator triggered by a standard gate signal. Lets you independently choose log, linear, or exponential curves for each A/D/R stage, giving a 12HP envelope module a wide range of shaping options.
Dual voltage-controlled filter usable as two independent VCFs or a stereo filter. Each channel offers nine output responses, a link mode, and a CV-controlled panner/crossfader for spatial filter processing in 18HP.
Dual VCA with both a vintage BJT circuit and a clean high-precision chip circuit on each channel. Packs zero-cross click suppression, stereo link, and an overdrive switch into 12HP.
14HP synth voice for crafting deep kick drums and cutting basslines alike. Includes a 1V/Oct VCO with four waveforms, a 3-wave mixer with a sub-octave sine, dual fast-switchable AR/AD envelopes, a high-quality VCA, and a multi-mode VCF.
Synth voice module optimized for acid sounds. Built-in VCO, VCF, and VCA reproduce TB-303-style sounds in a modular environment. Versatile input and CV control.
Reference Videos
Below are reference videos for the Trivium.
A Trivium introduction video by CatSynth TV. Trovarsi and Devin from Weston provide an overview of the Trivium’s features.
A detailed demo by Mylar Melodies showcasing the Trivium’s versatility with acid patches, kick drums, and bass modulation.
A hands-on demo by Alex106 exploring subtractive voice building and filter self-oscillation for sub bass.
Specifications
- Width: 12HP
- Depth: 26mm
- Power consumption: +12V: 60mA / -12V: 60mA
- Output impedance: 250Ω
- Input impedance: ≧100kΩ
- Gate input: 0V = Off, 1.5V+ = On
- Envelope level: 8V
- Power connection: 10-pin Eurorack connector (built-in polarity protection)
Included Items
- Power ribbon cable
- Screws
- Weston Precision Audio sticker
About Weston Precision Audio
Weston Precision Audio is a modular synthesizer maker based in North Carolina, USA.
We started carrying Weston Precision Audio after the founder, Devin, reached out to us by email about distribution. When the modules actually arrived, we still remember being struck by how beautifully made every single one was.
His modules show a real commitment to keeping that hands-on analog feel intact, and once you pick one up, the care he puts into materials and components becomes obvious — that is something we can promise.
Bonus: Modular Accessory Set by 電氣美術研究會 (Denki Bijutsu Kenkyukai) Included
In the hope that more people will get hands-on with modular synths, we have teamed up with 電氣美術研究會 to bundle a modular accessory set with this product.
The contents vary by season — patch cables, power cables, a dress-nut sample set, a mono splitter, and more. The set is included with the product, so please give it a try!
That concludes our introduction of the Trivium.
Takazudo Modular publishes manuals and related documents with Japanese translations. See the links below.
We hope you find this helpful.