ALM Busy Circuits D.S.G (2010s)
Three DIN sync jacks split into modular-friendly triggers - this is how you bridge Roland's 1980s heartbeat to your Eurorack rack.
Overview
Say you're elbow-deep in a patch, trying to get a TR-808 to play nice with a modern sequencer, and the sync won't lock. The jittery MIDI-to-CV workaround isn't cutting it. The ALM Busy Circuits D.S.G. doesn't make sound, doesn't modulate, doesn't even blink. It connects. It's a passive DIN sync distributor, and it's also a translator. It takes the 5-pin DIN sync signals from Roland's TR-606, TB-303 or MC-202 and breaks them into separate gate and clock signals that modular gear understands. No microcontrollers, no firmware, no USB. Just direct circuitry.
Designed in the early days of ALM/Busy Circuits, when Matthew Allum was still building modules in his London flat, the D.S.G. came out of a real problem: syncing early digital gear with modular systems. In the late 2000s and early 2010s Eurorack was still a niche world, and interoperability with vintage Roland boxes was clunky at best. Most solutions were DIY adapters or expensive, finicky interfaces. The D.S.G. is ruthlessly simple. It doesn't generate clock. It doesn't do anything active at all. It provides three DIN sync ports, each with clock and run signals split out to 3.5mm jacks. You can feed a single DIN sync source into one port and fan it out to multiple devices, or use the multiple inputs to switch between sync sources on the fly. Think of it as a patch bay for DIN sync.
The D.S.G. stayed minimal while other modules were busy adding features. There are no level shifters, no polarity switches, no LEDs. It's direct pass-through with buffered outputs to prevent signal degradation when daisy-chaining. That also makes it reliable. There's no firmware to corrupt and no chips to fail, just resistors, jacks, and traces on a PCB. Once installed, you forget about it.
Specifications
| Manufacturer | ALM Busy Circuits |
| Model | D.S.G |
| Model Number | ALM004 |
| Production Years | 2010s |
| Format | Eurorack |
| HP | 4 |
| Depth | 30mm |
| Current Draw +12V | 0mA |
| Current Draw -12V | 0mA |
| Function | DIN Sync Multiple & Distributor |
| DIN Sync Ports | 3 |
| Split Outputs | Clock and Run per port (6 total 3.5mm jacks) |
| Input Impedance | 100kΩ |
| Output Impedance | 1kΩ |
| Signal Type | Gate/Trigger (DIN Sync) |
| Power Requirements | None (passive) |
| Weight | 35g |
| Front Panel Material | Aluminum |
Key Features
Three Independent DIN Sync Ports with Split I/O
The D.S.G. gives you three full DIN sync jacks, each able to receive or transmit standard Roland-style DIN sync (24 pulses per quarter note). Each port's clock and run signals are split into individual 3.5mm jacks. You can take a single DIN sync output from, say, an MC-303, patch the clock to a sequencer's clock input and the run signal to a gate processor, all without adapters or signal loss. Or you can use one port as input and route its signals to the other two ports' outputs, which makes a buffered multiple. That flexibility is rare in passive modules.
Passive, No-Power Design
The D.S.G. needs no firmware updates and draws zero current from the bus - no +12V, no -12V, not even 5V. It fits into any system, however power-constrained, and it won't cause a brownout or need a separate power cable. The circuit is entirely passive, relying on impedance matching and buffering to maintain signal integrity. Some users report slight signal attenuation with very long cable runs, but it's sufficient for typical studio setups. With no active components there's almost nothing to break - no chips to desolder, no firmware to flash, no settings to lose.
Compact and Durable Build
At just 4HP, the D.S.G. is one of the smallest modules in the ALM lineup, but it doesn't feel cheap. The aluminum front panel is anodized black with white silkscreening, and the jacks are mounted securely with no wobble. The three DIN connectors are full-sized, not mini-DIN, so they accept standard Roland sync cables without adapters. The PCB has wide traces and solid solder joints, typical of ALM's early hand-assembled runs. Later production models may have shifted to automated assembly, but the design hasn't changed, and the build quality stays consistent across batches.
Historical Context
The D.S.G. arrived around 2010, when modular synthesis was moving from a niche hobbyist pursuit to a mainstream studio tool. Artists were blending vintage gear with modern systems, but the interfaces between them were often crude. DIN sync, once standard on Roland's early drum machines and sequencers, had been largely abandoned once MIDI took over. As producers rediscovered the groove of the 303 and 606, the need for reliable sync grew. Most early solutions were DIY projects or expensive third-party boxes. The D.S.G. was a purpose-built, Eurorack-native answer.
It also reflected ALM's design approach at the time: solve real problems with no-nonsense hardware. Other manufacturers were cloning classic VCOs or adding flashy displays. ALM focused on making modular systems work with the gear people already owned. The D.S.G. wasn't a sound module, but tight timing helps the sound. It shared DNA with other early ALM hits like Pamela's Workout, which also tackled sync. Pamela's is a programmable brain; the D.S.G. just carries signals without interpretation.
Competitors like Doepfer and Intellijel offered MIDI-to-CV solutions, but few addressed DIN sync directly. Some users jury-rigged solutions with breakout cables or passive multiples, but those often suffered from signal degradation or crosstalk. The D.S.G. was one of the first commercially available modules to treat DIN sync as a first-class citizen in Eurorack. It didn't try to replace MIDI or CV.
Collectibility & Value
The D.S.G. isn't a collector's item like a rare VCO or vintage synth, but it's a quiet staple in many racks. Because it's passive and simple, it rarely fails, so most units on the used market are fully functional. That reliability and its low original cost keep prices stable. As of 2026, a used D.S.G. typically sells for £40-£60, depending on condition and included cables. New-old-stock units from early production runs occasionally appear for £80-£100, but there's no real premium for age. The module hasn't changed over time, and there are no known revisions.
When buying used, check the DIN connectors and 3.5mm jacks. Over-tightening cables can strip the threads on the DIN ports, especially if users force incompatible connectors. The 3.5mm jacks are tougher, but repeated plugging can loosen them over time. A quick wiggle test will reveal any play. Also inspect the PCB for corrosion or poor soldering. Early ALM modules were hand-built, and while most are well assembled, a few may have cold joints. Failures are rare. There are no known design flaws or common points of failure beyond normal wear and tear.
Because the D.S.G. requires no power and has no firmware, it's immune to the obsolescence that plagues more complex modules. It will work just as well in 2030 as it did in 2012. That makes it one of the most future-proof modules in any Eurorack system. If you own vintage Roland gear or frequently integrate DIN sync devices, it's worth having one on hand, even if you don't use it every day.
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