ADDAC System ADDAC102 (2023–)

A tiny Eurorack radio that turns static into signal, FM broadcasts into raw material, and your modular system into a wirelessly tuned chaos engine.

Overview

There’s something quietly unhinged about patching a live FM radio into a 48-voice digital sequencer and watching the whole thing collapse into a warbled commercial for car insurance—especially when you triggered it with a triangle wave. The ADDAC102 VC FM Radio doesn’t just add sound to your rack; it smuggles the outside world in, one half-caught pop song or burst of static at a time. It’s not a sample player, not a synth, not even really an oscillator—though it can pretend to be all three. It’s a receiver, yes, but more accurately: a controlled breach. You’re not just listening to the radio. You’re weaponizing it.

Version 2 of the ADDAC102 refines the original concept with a critical tweak: it’s skiff-friendly. At just 5 cm deep, it tucks neatly into shallow cases without blocking adjacent modules or threatening to topple your entire system like a poorly balanced Jenga tower. That’s no small thing in Eurorack, where depth often decides whether a module gets a home or spends eternity in a drawer of rejected gear. The 8 HP width is similarly considerate—compact enough to justify its real estate, but not so cramped that the knobs feel like an afterthought. And make no mistake: you’ll be turning those knobs, even if you’re using CV to automate them. The tactile feedback of tuning through the dial, catching a snatch of talk radio before it dissolves into white noise, is part of the charm. This isn’t background texture. It’s interactive eavesdropping.

The module’s genius lies in its dual identity. On one hand, it’s a fully functional FM tuner, capable of locking onto stations across the 87.5 to 108 MHz band (with firmware tweaks available for Japan’s 76–96 MHz range). But more valuable to most modular users is its ability to generate noise—rich, organic, electromagnetically sourced noise—when no station is present. That static isn’t digital simulation; it’s the real hum and hiss of ambient RF energy, picked up via the included wire antenna (plugged into a 2.5mm jack on the front panel). It’s the sound of your studio’s Wi-Fi router arguing with the microwave, of distant taxi dispatchers, of forgotten walkie-talkies. And because it’s voltage-controlled, you can sweep through silence and signal with an LFO, jump between stations via gate triggers, or mute the output entirely with a logic signal. It’s not just a sound source—it’s a narrative device.

Specifications

Key Features

Voltage-Controlled Tuning and Search

The ADDAC102 doesn’t just let you tune the radio manually—it hands over control to your modular system. The Tune knob sets the base frequency, but a CV input lets you modulate that in real time, sweeping through the FM band with an LFO, sequencer, or random voltage source. Want to drift from a classical station into a burst of static and back again every 16 steps? Patch in a slow triangle wave. Need to jump abruptly between two stations based on a drum pattern? Use gates to trigger the Seek Up/Down inputs. The Search Up/Down functions are equally flexible, allowing fine-grained frequency adjustments of ±0.1 MHz (in EU mode) or ±0.2 MHz (in US mode), perfect for nudging into a weak signal or scanning for hidden noise pockets. These aren’t just conveniences—they turn the radio into a dynamic, responsive element in your patch, not a static sound generator.

Soft Mute Jumper and Noise as Feature

One of the most telling design choices on the ADDAC102 is the soft mute jumper on the back of the PCB. By default, soft mute is off—meaning the module doesn’t suppress output when no station is detected. That’s intentional. ADDAC wants you to hear the noise. In soft mute ON mode, the radio behaves like a consumer device: quiet between stations, clean when locked. But leave it off, and the static becomes a continuous, usable audio source. That hiss is rich with high-frequency detail and unpredictable transients—ideal for feeding into filters, ring modulators, or granular processors. It’s not white noise; it’s electromagnetic weather. The jumper gives you a binary choice: authenticity or polish. Most users leave it off. The noise is too good to silence.

Regional Firmware and Customization

While the standard firmware covers the European and North American FM bands, ADDAC offers a special version for Japan (76–96 MHz), which must be requested at purchase. This isn’t just a frequency shift—it’s a firmware-level adaptation, reflecting the company’s willingness to support niche markets. And if the black front panel doesn’t suit your rack’s aesthetic, ADDAC will make you a custom-colored one in red, green, blue, white, silver gray, yellowed silver, or bronze, with print options in black, white, or primary colors. It’s a rare level of personalization in the modular world, where most manufacturers treat panel color as fixed. The lead time is 4–6 weeks, and it’s not cheap, but for builders who treat their racks like instruments and installations, it’s a welcome option.

Historical Context

The ADDAC102 exists in a lineage of radio-based sound art that stretches back to Alvin Lucier’s I Am Sitting in a Room and the BBC Radiophonic Workshop’s tape manipulations. But in the context of modern Eurorack, it answers a specific aesthetic gap: the clinical precision of digital oscillators and sequencers often lacks the unpredictability of the real world. While modules like noise generators and sample players can simulate randomness, they’re still bounded by internal logic. The ADDAC102 bypasses that entirely. It’s not generating randomness—it’s harvesting it. At a time when modular systems are increasingly software-defined and internally consistent, the ADDAC102 is a deliberate vulnerability, a way to let the world interfere. It’s not the first radio module (Mutable Instruments’ Elements had a radio-inspired mode, and some DIY kits exist), but it’s the first commercially available Eurorack module to offer full voltage control over FM tuning, stereo output, and skiff-friendly packaging. That combination makes it a standout in a market that often prioritizes synthesis over reception.

Collectibility & Value

The ADDAC102 is too new to be considered vintage in the traditional sense, but its collectibility is already evident in niche circles. At €315 new, it’s not cheap for an 8 HP module, but its utility as both a sound source and a performance tool justifies the price for many. Used units trade for €250–€280 depending on condition, with custom panels commanding small premiums. Failures are rare—there are no moving parts, and the circuit is straightforward—but the 2.5mm antenna jack is delicate and can break if tugged. The module draws 100mA, which is moderate but worth noting in power-limited systems. No firmware updates or recalls have been reported, and ADDAC’s support is responsive for regional firmware requests. When buying used, verify that the jumper settings match your region and that the CV inputs respond linearly—some early units had minor calibration drift, though this is uncommon. The biggest risk isn’t technical—it’s conceptual. If you’re looking for a stable, predictable oscillator, this isn’t it. But if you want something that can surprise you, that might pick up a weather report in Portuguese during a live set, then the ADDAC102 is worth every euro.

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