ADDAC System 102 (2020–Present)

A small Eurorack FM radio. It picks up static and broadcasts and puts them on your patchbay.

Overview

That faint hiss under the pop song coming through your speakers is real signal. The ADDAC System 102 VC FM Radio tunes stations, but it also picks up everything around them. Turn the Tune knob past the last clear channel and you get whistles, distant chatter, power line hum and the digital chatter of cell towers. All of it is raw sound material. It changes with the weather, the time of day, and where you've mounted your rack. Most modular systems are full of predictable oscillators and clean waveforms. The 102 is the wildcard.

And yes, it actually works as a radio. From 87.5 to 108 MHz, it pulls in FM stations with surprising clarity, especially when you’ve got a decent external antenna plugged into the 2.5mm jack. But the real magic kicks in when you stop trying to find a song and start hunting for texture. The static between stations is rich, complex, and endlessly variable — far more interesting than most dedicated noise modules. It’s like having a contact mic on the atmosphere itself. Whether you’re sampling eerie drifts for ambient work or feeding bursts of interference into a granular processor, the 102 delivers unpredictability you can’t fake with algorithms. It’s not a gimmick. It’s a field recorder in module form.

The ADDAC 100 series lists the 102 as a sound generator with a twist. It sits between the purely synthetic sources and the utility modules that shape them. It isn't a workhorse like the 106 T-Noiseworks, and it isn't a precision tool like the 207 Intuitive Quantizer. It's a character module, the kind you reach for when a patch feels too clean. It doesn't generate traditional control voltages, but its audio output responds well to voltage control. You can sweep through frequencies with a sequencer, mute it with a gate, or jump between stations via CV.

Specifications

Manufacturer	ADDAC System
Production Years	2020–Present
Original Price	€315 / $399
Format	Eurorack
Width	8 HP
Depth	5 cm (50 mm)
Power Supply Compatibility	±12V and ±15V
Max Current Draw	100 mA (+12V), 100 mA (-12V)
Bus Board Cable	8×2 IDC (Doepfer style)
Frequency Range	87.5 – 108 MHz (standard), 76 – 96 MHz (Japan firmware available)
Channel Spacing	100 kHz (EU), 200 kHz (US) — jumper selectable
CV Inputs	Tune, Volume, Seek Up/Down, Search Up/Down — all with attenuators
CV Range	±10V
Gate Input Threshold	2.5V
Outputs	Stereo audio (two separate jacks)
Mute Function	Manual button and gate input
Soft Mute Feature	Configurable via jumper — disables automatic muting when no station is detected
Antenna	External wire antenna via 2.5mm jack
LED Indicators	Stereo output status, station lock
Custom Panel Options	Available in multiple colors and finishes — direct order only

Key Features

Voltage-Controlled Tuning with Precision Search

The Tune knob sets the base frequency. The real performance control is the CV input with attenuator. Sweep the dial with an LFO for slow drifts, or jump across the spectrum with a sequencer for abrupt, radio-surfing transitions. The Search Up/Down inputs nudge the frequency in 0.1 MHz (EU) or 0.2 MHz (US) steps, which makes it easy to hunt for weak stations without overshooting. Older radio modules only coarse-tune. The 102 gives you much finer control over where you land. The Search function can also be CV-triggered, so you can automate station-hopping patterns that feel almost algorithmic, even though they pull in real-world signals.

Soft Mute Jumper — The Secret to Noise as a Feature

Most FM modules silence the output when no station is locked, which kills the ambient noise floor. The 102 has a jumper to disable the soft mute, so static and interference bleed through continuously. That matters for experimental use. Leave the jumper off and you get a constant stream of electromagnetic texture to feed into filters, delays, or resonant circuits. Flip it on and the module behaves like a conventional radio, muting between stations. Service technicians note that users in urban areas often disable soft mute entirely and treat the module more like a noise oscillator than a tuner.

Skiff-Friendly Redesign and Antenna Flexibility

The Version 2 update wasn't only cosmetic. It cut the depth to 50mm, which makes it one of the few radio modules that won't bulge out the back of a travel skiff. The external 2.5mm antenna jack is important too. A simple wire, even a few inches of stripped cable, dramatically improves reception. Some owners report wrapping the antenna around the rack frame for better coupling. There's no internal antenna, so without a wire the module is nearly deaf. It also means you can try different lengths and placements to change the interference you pick up.

Historical Context

The ADDAC 102 arrived in late 2020. Most new Eurorack modules then focused on complex modulation, generative sequencing, or digital wavetable synthesis - clean, controlled, and repeatable. The 102 went the other way. It wasn't the first radio module, since early DIY builds and niche brands had dabbled, but it was the first to offer full voltage control, stereo output, and thoughtful design in a commercially available format. Many patches were sounding increasingly digital and sterile at the time, and the 102 brought in the unpredictability of the analog world by tuning into it directly.

It arrived alongside a broader trend of "found sound" integration in modular synthesis. Contact mics, cassette interfaces, and field recording modules were gaining traction. The 102 fit that trend by bringing the outside world into the patch without additional gear. Competitors like Intellijel's Uurke or the now-discontinued Critter & Guitari Pocket Operators offered radio-like functions, but none matched the 102's level of CV integration or build quality.

Collectibility & Value

The ADDAC 102 is still in production, so it isn't a vintage item in the traditional sense, but it has developed a cult following. New units sell for around €315 direct from ADDAC. Dealers like Perfect Circuit and Thomann list them at $399, a premium that reflects import costs and demand. Used prices hover between $250 and $325, depending on condition and whether the seller includes a custom panel. There are no widespread reliability issues, but collectors report a few quirks. The 2.5mm antenna jack is fragile. Repeated plugging can loosen it, and replacements are not standard. Owners recommend leaving a wire permanently attached or using a strain-relief sleeve.

The jumper settings on the back PCB need attention too. Misconfigured jumpers, especially EU/US spacing, can make the module seem "broken" when it's just set for the wrong region. Buyers should verify the firmware and jumpers match their location, particularly when sourcing from overseas. Units with custom panels command a 20-30% premium, especially in rare colors like Dark Bronze or Yellowed Silver. These are made to order and take 4-6 weeks to produce.

For live performers, the mute gate input is a lifesaver — it allows silent station surfing until the perfect audio snippet appears. But because the module relies on real-world signals, its usefulness varies by geography. In dense urban areas, it’s a goldmine of content. In rural or shielded environments, it may require an external antenna boost. That variability isn’t a flaw — it’s part of the module’s identity. If you want predictable noise, get a dedicated source. If you want something that changes with the city, the weather, or the time of day, the 102 delivers in ways no synth can replicate.