ADDAC System ADDAC202 (2010s–Present)
A tiny red module that doesn't make noise, but makes everything else louder, quieter, or just right.
Overview
The ADDAC202 doesn't oscillate, doesn't filter and doesn't sequence anything. It sits in the utility section of ADDAC System's 200-series as a 4 HP dual amplifier. It's the kind of module you don't think you need until you try patching without one. Think of a good pair of tweezers: small, precise, and handy when you have to nudge a CV signal into place or boost a thin envelope up to gate-level strength.
Each of the two independent channels has continuous gain control, from full attenuation (down to zero) up to a clean 10x amplification of the input signal. The signal can be audio or control voltage. That range is rare in a module this size. A weak LFO output can be stretched to sweep a filter across its full range, and a sub-audio modulation source can be boosted a little without adding noise. The module handles both positive and negative signal paths, with ±10V I/O compatibility, so it works with bipolar CV sources and won't clip when fed deep negative offsets.
Each channel also has two LEDs, red and green, that show output polarity. At a glance you can tell whether the signal is swinging positive or negative. That helps when you're inverting, offsetting or summing CVs and need to check phase relationships. Many utility modules offer no visual feedback at all. The build is typical of ADDAC's no-nonsense Eurorack approach: a sturdy red anodized aluminum panel (with optional custom colors available direct from the manufacturer), clearly labeled jacks, and a layout so intuitive it borders on boring, which in a utility module is a compliment.
The 202 lacks the vintage warmth of ADDAC's 700-series and the digital-analog hybrid quirks of their more experimental units. It isn't trying to be characterful. It's trying to be accurate and reliable, and it's the module to reach for when you want something to just work without coloring your sound. In a modular system, coloration is often already coming from multiple sources.
Specifications
| Manufacturer | ADDAC System |
| Production Years | 2010s–Present |
| Original Price | 120.00 € |
| Format | Eurorack |
| Width | 4 HP |
| Depth | 2.5 cm |
| Max Current Draw | 30 mA |
| Power Supply Compatibility | ±12 V or ±15 V |
| Bus Board Connector | 8×2 IDC (Doepfer style) |
| Channels | 2 |
| Gain Range | 0 to 10x (amplification), down to full attenuation |
| Input Signal Type | Audio or CV |
| Input Voltage Range | ±10 V |
| Output Voltage Range | ±10 V |
| Visual Indicators | 2 LEDs per channel (positive and negative polarity) |
| Custom Panel Options | Black, Green, Blue, White, Silver Gray, Yellowed Silver, Dark Bronze, Light Bronze |
| Print Color Options | Black, White, Red, Yellow, Blue, Green |
| Series | 200 Series – Analog CV Utilities |
Key Features
Gain That Actually Goes to Zero
Most attenuators let you turn a signal down, but few offer true nulling, where the output is completely silenced at the minimum setting. The ADDAC202 does. That matters in CV paths, like attenuverting envelopes or LFOs, where residual voltage can cause unintended modulation. The taper is smooth and consistent, which allows fine adjustments even at low gain settings. Whether you're trimming a modulation depth to 5% or boosting a faint clock divider output, the knob is responsive and predictable.
Signal Polarity at a Glance
The dual-color LEDs on each channel work as a diagnostic. If the red LED is lit, the output is positive. Green means negative. When both are off, the signal is near zero. When both flicker, an AC signal is swinging through the zero point. In a patch with inversion, offset or bipolar modulation, this saves time and guesswork, and it removes the need for an oscilloscope just to verify basic signal behavior.
Compact, Skiff-Friendly Design
At only 4 HP wide and 2.5 cm deep, the ADDAC202 fits into even a crowded skiff or travel case. It doesn't demand power and doesn't generate heat. It still delivers full dual-channel functionality with independent controls and monitoring. Utility modules often take 6 or 8 HP for similar features, so this is dense for the format. It's easy to add "just in case" because it won't cost much rack space.
Historical Context
The ADDAC202 emerged during the mid-2010s Eurorack boom, when modular synthesis shifted from boutique curiosity to mainstream adoption. As racks grew more complex, demand for reliable, high-quality utility modules surged. Many manufacturers focused on sound-generating or effects modules. ADDAC System carved a niche by treating utilities as essential tools instead of afterthoughts. The 200-series, of which the 202 is a core part, was designed to solve common patching problems with no-compromise solutions.
At the time, many utility modules were either overly simplistic (single-channel attenuators with no monitoring) or overengineered (multi-function units that sacrificed clarity for versatility). The ADDAC202 struck a balance: dual channels, full gain control, visual feedback and solid build quality, all in a compact form. It wasn't revolutionary in concept, since amplifiers have been part of synthesis since the 1960s, but its execution was modern and tailored to contemporary modular users. It arrived alongside similar utility-focused offerings from Intellijel, Mutable Instruments, and Doepfer, but stood out for its combination of visual feedback and gain range.
ADDAC System, based in Portugal, had already built a reputation for blending analog and digital design in creative ways, like the ADDAC112 granular looper and the ADDAC506 stochastic function generator. The 202 wasn't about innovation for its own sake. It was about doing one thing well, in an ecosystem where digital modules often dominated the headlines.
Collectibility & Value
The ADDAC202 isn't a collector's item in the traditional sense. It doesn't appreciate in value, isn't produced in limited runs, and doesn't carry the mystique of a vintage Roland or Moog. Within the modular community it's considered a staple, a "must-have" utility that frequently appears on build lists for new and experienced users alike. Its current market value remains close to its original price of €120, with used units typically selling between €80 and €110 depending on condition and whether they've been customized.
The module has no moving parts beyond the potentiometers and uses a simple analog circuit, so it is exceptionally reliable. There are no known failure-prone components, no power-related issues, and no firmware to update. The most common issue reported is potentiometer wear from heavy use, which can lead to crackling or inconsistent gain. Even this is rare, given the module's typical role as a set-and-forget utility. Cleaning the pots with contact cleaner usually resolves any noise issues.
For buyers, the main consideration is configuration more than condition. ADDAC offers custom-colored front panels (black, green, blue, etc.) with different print colors, and some users seek out specific combinations for aesthetic reasons. These custom versions often command a slight premium, especially if they're from limited color runs or older production batches. The red standard panel remains the most common and widely available.
Given its ongoing production and steady supply, there’s no urgency to buy the ADDAC202 as a speculative investment. But as a functional purchase, it’s a smart one. It’s the kind of module that pays for itself in patching efficiency—solving problems before they arise, and doing so with a level of precision that cheaper alternatives often lack. If your rack lacks a dedicated dual amplifier with visual feedback, the 202 isn’t just a good buy—it’s a necessary one.
Similar items on eBay
No exact ADDAC System ADDAC202 listings are live right now — these searches show current ADDAC System and similar vintage synth gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.