ADDAC306 VC Transitions (Introduced [VERIFY: year not confirmed])

Five little sliders, one big idea: a hands-on way to morph entire patches in real time, all from a single 8 HP module built for performance.

Overview

The ADDAC306 VC Transitions pulls five CV strings at once with one slider motion. It's not a sequencer, not an envelope, not a mixer. Made by ADDAC System in Portugal, this compact Eurorack module is part of their ADDAC300 Series, branded as "Expressive Controls." Owners report it's especially potent in live performance, where sweeping changes across multiple parameters (filters, oscillators, effects, levels) can be run with a single fader.

The concept is simple. There are five independent CV channels, each with its own minimum and span, all responding to a shared Transition Controller slider. Slide from A to B, and each channel moves from its minimum to maximum (or vice versa, depending on direction). It's like an ADSR with five outputs, or a five-way attenuverter with memory, but without the digital complexity. There's no screen, no menus, no patch programming. You set it, tweak it, and perform with it. It's been described as "nifty" and "super useful on a performance system," and one user put it plainly: “It’s super easy to set it up any way you want.” Another praised its hands-on nature: “One of the not-so-obvious strengths of the ADDAC module is that it’s really hands on.”

It has quirks. One user on MOD WIGGLER noted that as soon as you patch a CV signal into the input, the main slider stops acting as a manual controller and becomes an attenuator for the incoming CV. You lose direct manual control, unlike some comparable modules (like the MakeNoise Makenoise Lx, referenced in the forum post), where the knob stays active. You gain external control and give up the tactile sweep. If you use it as a dynamic processor, that's fine. If you rely on manual sweeps during performance, you'll need to plan around it.

Users have repurposed it as an ADSR/LFO multi-mangler, a sequence polyphonizer (by sending a monophonic sequence through it and into a quantizer like the ADDAC207), or even a chord progression generator. Found Sound suggests using it to “send a sequencer to five different destinations with different voltage levels for each” or to “dial in sweet spots on your favourite filters.” It's also possible to daisy-chain two units via the CV input to control up to nine outputs with one slider.

Specifications

Manufacturer	ADDAC System
Format	Eurorack
Width	8 HP
Depth	4 cm / 40mm
Number of channels	5
CV inputs	+5v
CV outputs	jumper selectable: +5v or +10v
Output voltage range	Can be set to either 5 or 10 volts maximum per channel via jumpers on the back
Output polarity	Only positive voltages are generated at the output
Max current / Power consumption	+40mA/-20mA
Bus Board Cable	8 x 2 IDC (Doepfer style) connector
DIY Kit price	87€ (Excl. VAT)

Key Features

Five Channels, One Slider

Each of the five channels has MINIMUM and SPAN controls, which set the starting voltage and the total range. The DIRECTION switch sets whether the channel ramps up (from minimum to maximum) or down (from maximum to minimum) as the Transition Controller slider moves from A to B. Because direction is per channel, one filter can open while another closes, or an LFO rate can increase as a wavefolder depth decreases, all in sync. The common slider ties it together, so one gesture stages parameter shifts across your system.

CV Input as Control Expander

The CV IN jack lets you modulate the transition point with an external signal, say an LFO, envelope, or sequencer. When patched, the slider becomes an attenuator for that incoming CV, not a direct voltage source. Instead of sweeping manually, you shape how an external control signal affects your five CV outputs. You can't use the slider manually and accept external CV at the same time. Users have noted that limitation. There's no mode switching, just analog signal flow.

Jumper-Selectable Output Range

On the back of the module, five jumpers (one per channel) set the maximum output to either +5V or +10V. That helps match different modules' CV requirements - some VCOs respond better to 10V ranges, while others (like certain filters) might only need 5V. You can mix ranges across channels. All outputs are positive-only, and no negative voltages are generated. If your patch needs bipolar control, you'll need to offset or invert externally.

Compact and Performance-Ready

The Transitions is just 8 HP wide and 40mm deep, so it fits into crowded racks. It's built to be grabbed and swept during live sets. The slider is large and smooth. Since it's part of the ADDAC300 Series, it shares a design language with other expressive controllers.

No Audio Mixing—Just Pure CV

Unlike some comparable modules (such as Mutable Instruments Frames, which can mix audio or pass CV per channel), the Transitions is strictly for control voltage. There's no audio path here. That avoids crosstalk or noise issues that can plague mixed-signal modules. It also means you won't accidentally route audio through it and wonder why it sounds thin.

Historical Context

The ADDAC306 VC Transitions emerged when macro control and performance-oriented modules were gaining traction. It's been compared directly to the Mutable Instruments Frames and the Mannequins Cold Mac, both of which offer multi-channel control but with different approaches. Frames allows per-channel audio mixing or CV routing but requires menu navigation and programming. The Cold Mac is more of a dynamic voltage processor with logic-based behavior. The Transitions has no menus, no code, no setup. You turn it on, patch it, and move the slider. It was developed from an initial idea by Konstantine Fioretos, though the exact timeline of development hasn't been documented.