4ms Dual Looping Clock Divider (2009–2018)

Two independent clock dividers that don’t just split time—they bend it, loop it, and reset it on a whim.

Overview

If your modular rig feels too predictable, too metronomic, too obedient, the 4ms Dual Looping Clock Divider (DLCD) is the quiet anarchist you didn’t know you needed. It doesn’t generate clocks—it rethinks them. Born in the fertile patch of early Eurorack expansion, when clock manipulation was still mostly about binary division and reset triggers, the DLCD arrived with a sly grin and a bag of tricks that made even seasoned patchers pause. This isn’t a utility module you tuck in the corner and forget; it’s a compositional partner, a rhythmic co-conspirator that turns rigid grids into spirals and lattices. It doesn’t just divide your clock signal by 2, 4, or 8—it lets each of its two channels count up to a user-defined maximum, then loop back, creating polyrhythmic sequences that breathe, stutter, and surprise.

The magic lies in its “looping” nature. Unlike standard dividers that endlessly halve incoming pulses, the DLCD lets you set a custom count length—say, divide by 5, then reset. Or 7. Or 13. Each channel has its own independent count range, reset control, and CV input for dynamic modulation. That means you can have one side pulsing in a tight 3/4 waltz while the other crawls through a 17-step cycle, both syncing back to the same master clock but dancing to entirely different internal rhythms. And because the reset point is voltage-controllable, you can modulate the loop length in real time, creating evolving sequences that feel organic rather than algorithmic. It’s the difference between a metronome and a heartbeat.

Positioned between the simpler 4ms Rotating Clock Divider (RCD) and the more complex QCD (Quad Clock Divider), the DLCD carved out its niche as the “Goldilocks” of intelligent clock division—more flexible than basic dividers, less complex than quad units, but with a unique looping architecture that no other module offered at the time. It wasn’t trying to be the most channels or the fastest response; it was trying to be the most musical. And for composers working with generative sequences, polyrhythms, or ambient textures, it delivered. The front panel is sparse—two identical channels, each with a knob for setting division count, a reset button, CV input, and outputs for divided clock and reset pulse—but that simplicity belies the depth underneath. There’s no display, no menu diving, no firmware updates required to access core functions. What you see is what you get, and what you get is pure, tactile rhythm design.

Specifications

Key Features

Looping Division with Dynamic Reset

The defining trait of the DLCD is its ability to count a set number of incoming clock pulses and then reset—automatically. This isn’t just division; it’s rhythmic phrasing. You can set one channel to output a pulse every 5 clocks, then reset, creating a steady quintuplet pattern. Or modulate the count via CV to shift between 3 and 7, generating irregular groupings that feel more like jazz than techno. The reset pulse output is equally valuable: patch it to a sequencer’s reset input, and suddenly your 8-step sequence restarts every 7 master clocks, creating a slow drift that never quite repeats. This kind of behavior is gold for generative music, where predictability kills the magic. The module doesn’t just divide time—it fractures it.

Independent Dual Channels with Full CV Control

Each of the two channels operates completely independently, with its own division knob, CV input, and outputs. This means you can run two entirely different rhythmic sub-systems from one master clock. One channel might be dividing by 4 to drive a bass sequence, while the other counts to 11 to trigger a sparse percussion pattern. The CV input responds to 1V/octave scaling, so you can use a sequencer, LFO, or random source to change the division count on the fly. Want a rhythm that starts in 4/4 and gradually shifts into a 7-beat cycle? Patch an LFO to the CV input and dial in the range. The response is smooth and musical, not stepped, which makes transitions feel organic. And because the CV input affects the count length, not just the division ratio, the rhythmic implications go far beyond standard clock manipulation.

Reset Logic and External Sync

Each channel includes a dedicated reset button and reset input, allowing external triggers to force a restart of the counting cycle. This is crucial when syncing to other sequencers or when you want to align multiple DLCDs across a system. The reset input is normalled to the internal reset logic, so if you don’t patch anything, the module resets automatically when it hits the set count. But patch in an external trigger—say, from a bar-end pulse or a manual button—and you can override the loop at any time. This makes the DLCD incredibly flexible in live performance, where you might want to restart a looping pattern on the downbeat. The reset pulse output can also be used to trigger other events—envelopes, sample-and-holds, or even other clock dividers—turning the DLCD into a rhythmic hub rather than just a passive divider.

Historical Context

The DLCD emerged in 2009, right as Eurorack was shifting from boutique curiosity to widespread adoption. At the time, clock management was still largely handled by basic dividers—often just /2, /4, /8 outputs with no modulation or reset control. Modules like the Doepfer A-160 series got the job done, but they were static. The DLCD, along with contemporaries like the Qu-Bit Turing Machine and the Intellijel Metropolis, represented a new wave: intelligent, dynamic timing modules that treated rhythm as a malleable, expressive parameter rather than a fixed grid. 4ms Company, already known for the innovative Dual Looping Delay, positioned the DLCD as a companion piece—a way to generate complex, evolving clock structures that could drive those long, textured delays.

It wasn’t the first to offer voltage-controlled division, but it was among the first to make looping counts intuitive and performable. Competitors like the ALM Busy Circuits Pam’s New Workout offered more complexity, but at a steeper learning curve. The DLCD struck a balance: deep enough for advanced users, simple enough for beginners to grasp immediately. It also arrived before the explosion of clock sequencers and Turing machines, giving it a window of uniqueness. By the mid-2010s, modules like the Mutable Instruments Marbles and the ALM Grids began offering similar generative timing, but the DLCD’s focus on looping counts—rather than probability or randomness—kept it distinct. It wasn’t trying to create chaos; it was trying to create structure—just not the kind you could write in 4/4.

Collectibility & Value

The DLCD is no longer in production, having been quietly discontinued around 2018, but it remains a sought-after module among Eurorack purists who value hands-on, deterministic rhythm design. On the used market, prices range from $250 to $380 depending on condition and seller. Units with clean faceplates, responsive knobs, and no solder blemishes command the higher end, especially if sold with original packaging or documentation. Because it contains no firmware, there are no update-related issues or bricking risks—what you buy is what you get.

Mechanically, the DLCD is robust. It uses standard PCB-mounted jacks and sturdy potentiometers, and there are no known design flaws or recurring failures. The most common issue reported is intermittent contact on the reset buttons, usually due to dust or wear, but this is easily remedied with contact cleaner. There are no electrolytic capacitors to dry out, no displays to fail, and no microcontrollers to crash—just discrete logic and passive components, making it one of the more reliable modules of its era. That said, because it’s been out of production for several years, replacement parts are not officially supported, though the design is simple enough that experienced technicians can service it without difficulty.

When buying, check that both channels respond consistently to clock input across all division settings, and verify that the reset function works reliably—both manually and via the CV input. Some users have reported slight CV scaling drift over time, but this is rare and usually correctable with calibration. Avoid units with bent or loose jacks, as the PCB is not reinforced for heavy cable strain. Overall, the DLCD is a low-risk vintage purchase: no ticking time bombs, no hidden flaws, just solid, enduring design. It won’t appreciate like a vintage Roland, but it will hold its value among modular collectors who appreciate its niche.

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