ADDAC 306 Touch Controller (2019–)

A five-channel voltage choreographer that turns a simple slide into a symphony of shifting parameters

Overview

It doesn’t make a sound, but plug the ADDAC 306 Touch Controller into the right patch and it becomes the most expressive thing in your rack. That slider isn’t just a fader—it’s a conductor, sweeping across five independent CV channels and reshaping your entire sonic landscape in real time. You set the start and end points for each channel, define their range and direction, then glide from one state to another like a DJ crossfading between worlds. It’s not just about automation; it’s about performance. The kind where you can freeze a chaotic patch in "state A," sculpt a completely different one in "state B," and then, with one smooth motion, dissolve from one reality into the next.

Originally introduced as the ADDAC 306 VC Transitions, this module occupies a rare niche: a hands-on macro controller that doesn’t rely on presets or digital recall. Instead, it’s tactile, immediate, and deeply analog in philosophy. Each of the five channels features MINIMUM, SPAN, and DIRECTION controls—no digital menus, no menu diving, just knobs and switches doing the work. The MINIMUM sets the baseline voltage, SPAN determines how far above that baseline the output can climb, and DIRECTION flips whether the transition moves up or down as the slider advances. The result? Five completely independent CV curves, all slaved to a single physical gesture. Want one parameter to rise while another falls, and a third to jump abruptly halfway through? Done. It’s like having five tiny envelope followers, but with manual override and infinite tweakability.

And while it’s billed as a “touch controller,” don’t expect capacitive pads or ribbon strips—the “touch” here is literal: you touch the slider. It’s a sturdy horizontal fader, not the tiniest component on the panel, but not huge either. Some users report it feels a bit cramped in dense racks, especially when trying to make subtle adjustments mid-performance. But that’s part of its charm: it demands engagement. You’re not just setting and forgetting; you’re performing. The module also accepts a CV input, so you can replace manual control with an LFO, sequencer, or envelope, turning the slider into an attenuverter for the incoming signal. This turns one ADDAC 306 into a modulation multiplier—patch an ADSR into the CV IN and suddenly you’ve got five differently shaped envelopes derived from a single source.

Specifications

Key Features

A Five-Channel Voltage Morph Engine

The heart of the 306 is its ability to morph between two defined voltage states. You don’t program curves—you sculpt them in real time. Set all five MINIMUMs to define “state A,” then adjust the SPAN controls to define “state B.” Slide the fader, and each output ramps or drops accordingly, based on its DIRECTION switch. This isn’t a sequencer or a random generator; it’s a transition machine. It excels in live performance, where you might want to shift an entire patch from “ambient drift” to “rhythmic chaos” with one hand. Musicians have used it to morph filter cutoffs, LFO rates, oscillator pitches, effect mix levels, and even sequencer gate lengths—all in sync, all tied to a single gesture. The result feels organic, almost cinematic: not just change, but evolution.

CV Control with Manual Override

While the slider is the star, the CV input turns the 306 into a modulation multiplier. Patch in an LFO, and the slider becomes an attenuator, letting you manually scale how much of that LFO affects the transitions. Patch in a gate or trigger, and you can snap between states abruptly. This dual nature—manual and voltage-controlled—makes it unusually flexible. You can automate the transitions during composition, then take manual control during performance. Or use the CV input to slave multiple 306s together, creating even broader control surfaces. Two modules give you ten channels under one slider; three give you fifteen. The only limit is rack space and power.

Jumper-Selectable Output Range

Each channel’s maximum voltage can be set via internal jumpers to either 5V or 10V. This is a small detail with big implications. In a system where some modules respond better to 0–5V (like many quantizers or digital oscillators), while others thrive on 0–10V (like analog filters or VCAs), the 306 lets you tailor each output independently. You’re not stuck with a one-size-fits-all CV range. This level of customization is rare in modules at this price point and speaks to ADDAC’s attention to practical workflow. Just don’t forget to grab a tiny screwdriver before firing up your soldering iron.

Historical Context

The ADDAC 306 arrived in 2019, a time when Eurorack was deep into the era of “utility” modules—small, focused tools that solved specific patching problems. While others were building complex digital brains or analog monsters, ADDAC went small and smart. The 306 wasn’t trying to be a sound source or an effects processor; it was a meta-controller, part of a growing trend of modules that let users shape entire patches rather than individual parameters. It shared DNA with modules like the Livestock Electronics Ellis, the FSS Makrow, and the Befaco Rampage, but stood out with its five-channel design and hands-on immediacy. Unlike the Makrow’s single-knob simplicity or the Ellis’s voltage-processor complexity, the 306 struck a balance: simple enough to learn in minutes, deep enough to use for years.

It also reflected ADDAC’s broader philosophy: hybrid instruments that blend analog control with digital precision. Though the 306 is fully analog in operation, its design feels digital in intent—clean, logical, modular. It was developed in collaboration with Konstantine Fioretos, a designer known for elegant, performance-oriented tools, which explains its stage-ready feel. At a time when many modules were becoming more esoteric, the 306 was refreshingly direct. No menus, no screens, no patch memory—just voltage, knobs, and a slider you can actually grab.

Collectibility & Value

The ADDAC 306 isn’t a vintage item in the traditional sense—production began in 2019 and continues today—but it’s already earned cult status among modular performers. Its value holds well, especially for assembled units. While the DIY kit retailed for around €114, completed modules often sell for $200–$250, depending on condition and seller. Used units in good working order typically go for $150–$180, making it one of the more affordable ways to add macro-control to a system.

Failures are rare, but there are a few things to watch for. The slider, while robust, can wear out with heavy use—listen for crackling or dropouts when moving it slowly. The jumpers for voltage range are tiny and can be dislodged during shipping or installation, so verify output ranges if buying used. Since it was sold as a kit, some units may have been poorly assembled—check for cold solder joints, especially on the power connector and output jacks. A multimeter test for shorts is always wise before plugging into a powered system.

For collectors, the 306 isn’t about rarity or resale value—it’s about utility. It’s the kind of module that, once you’ve used it, you can’t imagine living without. It doesn’t age like a vintage synth; it integrates. And because it doesn’t make sound, it’s often overlooked in “must-have” lists—until you see it in action. Then it’s obvious: this is the hidden hand behind the magic.

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