ADDAC System 805.VS2 (–)
When you need to move signals around like a sonic air traffic controller — and do it with CV precision — this is the module that doesn’t flinch.
Overview
The ADDAC System 805.VS2 VC Signal Router isn't flashy. Officially it's the ADDAC805.VS2, a Eurorack module that does one job: it moves and blends audio and control voltage signals across multiple channels with voltage control. It's not a synth voice and not an effects processor. It lets you rewire a patch on the fly, morph between sources, or build evolving stereo scenes without lifting a cable.
The 805.VS2 takes cues from the waveform mixing section of the ADDAC701 VCO and evolves the company's earlier X-Fade/Panner concept into a full stereo voltage-controlled signal router. It handles both audio and CV, and it offers real-time crossfading, panning, and what ADDAC calls "4 quadrant mixing". That lets you manipulate signal polarity and routing well beyond a simple left-right balance.
And while it doesn’t generate sound, its role is anything but passive. With 24 input channels — each capable of handling either audio or CV — and 12 outputs, the 805.VS2 becomes a central nervous node in complex systems. Whether you’re blending drum layers, modulating filter banks, or dynamically shifting stereo imagery, it gives you the tools to do it musically, not just technically. The fully analog audio path uses high-quality, low-noise VCAs, so you’re not sacrificing sonic integrity for flexibility.
Specifications
| Manufacturer | ADDAC System |
| Dimensions | 8 HP |
| Depth | 45 mm |
| Current Draw | 40 mA +12V, 40 mA -12V, 0 mA 5V |
| Signal input | +/- 10V |
| CV input | +/- 5V |
| Features | 6 mono inputs |
| Features | 2 dedicated X-faders with Control knob + CV Input and Attenuverter |
| Features | Stereo direct inputs |
| Features | Mono Sum output |
| Audio path | Fully analog audio path with high quality/low noise VCAs |
| Features | The module features two dedicated X-faders and a stereo VCA that can also be used as a third X-Fader |
| Features | The module is equipped with 24 input channels, each capable of accepting both CV and audio signals |
| Features | The module features 12 output channels |
| Features | The module has reversible attenuators on the CV inputs |
Key Features
Two X-Faders and a Hidden Third
The 805.VS2 has two dedicated X-faders, each with a manual control knob, CV input, and attenuverter, so you can invert the CV signal's polarity on the fly. That's handy for bidirectional modulation, like a filter sweep that goes forward and backward depending on the control voltage. The stereo VCA can also double as a third X-fader. You can route a third pair of sources into the stereo master and modulate their balance independently, without adding clutter to the panel.
24 Inputs, 12 Outputs — All Flexible
The numbers alone tell part of the story: 24 input channels and 12 outputs. But what makes this impressive is that every input can handle both audio and CV. This blurs the line between audio routing and modulation routing, letting you use the same module to crossfade between drum loops and LFOs alike. No need to dedicate separate mixers or routers — the 805.VS2 handles both domains seamlessly. The 6 mono inputs and stereo direct inputs are clearly laid out, but the real power lies in how they feed into the internal matrix, enabling complex signal choreography.
4 Quadrant Mixing via Stereo Master
ADDAC's "4 quadrant mixing" is a real routing trick, enabled by using the stereo master as an X-fader between left and right channels. By manipulating both amplitude and polarity, you can create phase cancellations, polarity-flipped blends, and dynamic stereo imaging that shifts in unpredictable ways. It works particularly well with feedback patches or stereo effects returns, where small shifts in balance can change the texture a lot.
Reversible Attenuators — A Game Changer
The CV inputs have reversible attenuators. Most modules let you scale a CV signal down, but few let you flip its polarity without patching through an inverter. Here, a simple switch takes you from "more brightness with increased CV" to "less brightness", which saves cables. As one MOD WIGGLER reviewer put it: "X-Pan has fixed routing and has no CV attenuators, whereas the ADDAC805.VS2 has plenty of routing options and reversible attenuators on the CV inputs."
Build Quality: Nutless Jacks and Solid Feel
Owners have noted the excellent build quality, with one reviewer (Richard Brewster, Electronic Sounds) remarking it was the first time they'd seen nutless jacks used on a panel. These jacks are mounted directly through the front panel without the usual locking nuts. That gives a cleaner, more industrial look and potentially reduces panel stress over time.
Historical Context
The ADDAC805.VS2 is part of the ADDAC800 series, a lineup categorized under “Analog Sound Utilities” on the manufacturer’s website. It was designed as an evolution of the company’s earlier X-Fade/Panner concept, specifically inspired by the waveform mixing section of the ADDAC701 VCO. By updating that design to a stereo configuration and expanding its routing capabilities, ADDAC positioned the 805.VS2 as a more versatile, modern solution for modular signal management. While no specific release year has been confirmed, its design philosophy reflects a shift toward multi-role utility modules in Eurorack — tools that don’t generate sound but enable more expressive use of those that do.
Collectibility & Value
The ADDAC805.VS2 is not rare, but it's not a commodity either. New assembled units have been listed at $195.00 (Perfect Circuit, circa 2018) and resale prices range from $229.00 to $645.73, which suggests variability in condition, region, or seller markup. Kits were available from ADDAC System at 129€ (excl. VAT), while Thonk offered kit prices between £24.75 and £29.25. The kits cost less, but assembly requires skill.
There's no widespread report of chronic failures, but at least one documented issue exists: a gain problem that ADDAC addressed with a DIY fix, shared via Pugix.com. That suggests the company supported owners after purchase. User feedback is sparse but positive. One reviewer called it a "great voltage controlled crossfader" and another "quite a nice module," and one noted its superior flexibility over comparable modules like the X-Pan.
Given its utility and solid build, the 805.VS2 holds value well for a niche signal router. It’s not a showstopper on a rack, but for modular users who patch dynamically, it’s the kind of module that quietly becomes indispensable.
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