AMSynths AM1021 (2024–Present)
A 4HP Eurorack module that adds step-sequencing functions to the Behringer 1027.
Overview
Plug this little black panel into the side of a Behringer 1027 Clocked Sequential Controller and the 1027 starts acting like the rare ARP 2500 module it's trying to emulate. The AM1021 isn't a standalone sequencer. It's an upgrade that unlocks functionality built into the 1027's design but left dormant at the factory. With it, you can chain sequences of 8, 16, or 24 steps, route them in order, and step through complex patterns that would otherwise take a nest of patch cables and a spreadsheet.
AMSynths, the UK-based boutique builder known for ARP and Roland System 100M recreations, did more than add a few logic chips. The AM1021 works directly with the 1027's internal clock and step logic, using the same analog switching architecture that vintage gear relied on. There's no microcontroller faking it. This is hard-wired sequential logic. It doesn't generate voltages or triggers on its own. It orchestrates the 1027's existing outputs, telling each step when to fire and when to rest. The sequencing is smooth and jitter-free, and it feels mechanical in the good sense.
It's not flashy, and it won't replace a full-featured sequencer like the PPG 314 or Roland 182. But if a 1027 is in your rack and you find yourself manually resetting sequences or patching around its limits, the AM1021 fills that gap. It doesn't add new waveforms or filters. It adds sequencing logic. And at 4HP, it doesn't take much rack space.
Specifications
| Manufacturer | AMSynths |
| Production Years | 2024–Present |
| Module Format | Eurorack |
| HP Size | 4HP |
| Depth | 35mm |
| Power Requirements | ±12V, 30mA each rail |
| Function | Sequential Switch for Behringer 1027 |
| Sequence Lengths | 8, 16, or 24 steps |
| Integration | Direct internal connection to Behringer 1027 |
| Switching Type | Analog sequential logic |
| Control Inputs | Clock, Reset, Step |
| Outputs | Sequential switching of 1027 step outputs |
| Panel Material | 2mm powder-coated aluminum |
| Mounting | M3x8mm screws and washers included |
| Warranty | 2 years against defects |
| Country of Origin | Hand-built in Sussex, England |
Key Features
Analog Sequential Logic, Not Digital Emulation
The AM1021 doesn't use a microcontroller to simulate step sequencing. It relies on discrete analog logic chips to manage the sequence flow. That means no digital latency, no firmware bugs, and no glitches from clock jitter. It behaves like the original ARP 2500 modules it's inspired by: deterministic and predictable. When you hit reset, it goes to step one. When you send a clock, it advances. There's no buffering, no quantization, no hidden processing. This matters for tight rhythmic patterns, especially when syncing to external analog clocks or drum machines that don't follow MIDI's rigid rules.
Seamless Integration with Behringer 1027
The module isn't a separate unit. It docks onto the side of the Behringer 1027 and connects via an internal header. This isn't a patch-cable workaround. It's a hardware upgrade. Once installed, the 1027 can loop through longer sequences without manual intervention. The AM1021 handles the sequencing logic while the 1027 keeps generating the gate and CV outputs. No firmware mods and no soldering (beyond the initial install), and no risk of damaging the original board if installed correctly.
Expandable Sequence Lengths
The stock 1027 is limited to 8-step sequences with manual reset. The AM1021 unlocks 16- and 24-step patterns by chaining multiple cycles together. That allows evolving sequences, longer melodic phrases, and rhythmic structures that unfold over time. You're no longer stuck in 8-bar loops, and you can cycle through variations before repeating. Front-panel switches select the sequence length, so you can change it on the fly during performance. It's not random access or programmable memory. It's step-by-step progression.
Historical Context
The AM1021 exists because the Behringer 1027 is an affordable clone of the ARP 2500's Clocked Sequential Controller, but it ships with only basic functionality enabled. The original ARP module was part of a larger system where sequencing could be expanded with additional logic modules, and Behringer didn't replicate that. AMSynths filled the gap, not by cloning a vintage part, but by designing a modern companion that unlocks what was already there.
In the 1970s, ARP didn't sell a standalone "sequential switch." Sequencing logic was built into larger systems or added via custom patching. The AM1021 isn't a digital sequencer with a retro faceplate. It extends an analog workflow, for users who want vintage-style sequencing without the $5,000 price tag of an original ARP system. Modern manufacturing also lets small builders like AMSynths produce specialized modules for niche audiences, which wasn't possible in the pre-Eurorack era.
Collectibility & Value
The AM1021 isn't a collectible in the traditional sense. It's a new production module, hand-built in small batches by a small UK company. It has no vintage cachet, but it has utility, and that drives its value. It costs £139 direct from AMSynths, which makes it a premium but accessible upgrade rather than a luxury item. It requires the Behringer 1027 to function, so its market is inherently limited. Secondhand prices remain close to retail, and few units appear on the used market.
There are no known failure points specific to the AM1021. It's a simple logic board with minimal components. Improper installation is the biggest risk. Because it connects directly to the 1027's internal header, misalignment or forced mounting can damage the host module. Service technicians observe that users should verify pin alignment before securing the module and avoid excessive force. The 1027 itself is known to have occasional issues with clock stability or step skipping, but these are unrelated to the AM1021 and usually stem from power supply noise or aging components in the Behringer unit.
If you're buying used, check that the module is fully seated and that the 1027 still functions independently. Ask whether the seller has tested all sequence lengths and whether the reset function works reliably. AMSynths includes a two-year warranty, so used units outside that window have no safety net. Given the simplicity of the design, long-term reliability appears solid.
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