A modern black-panel bridge between Behringer's 55 and the original Moog 993's trigger logic - eight switches, zero normalization, and a soldering iron required.
Overview
The AMSynths AM993 is not plug-and-play. It is not a standalone synth module you patch into the rack and forget. It is a signal router that brings back the logic of the 1968 Moog 993 Triggers and Envelope Control module, in 8HP of black anodised aluminum. It doesn't generate sound, shape it, or filter it. What it does is control how triggers and gate signals flow between modules, particularly within the Behringer System 55 ecosystem. It's aimed at anyone who looks at the back of a Behringer 911A and wants it to behave more like a real vintage Moog. You reroute control voltages and triggers with the flick of a switch.
The AM993 is built to complement the Behringer System 55, and its real work happens behind the front panel. It connects to the 902, 911, and 911A modules through a harness of Molex 2- and 3-pin connectors, linking to daughter PCBs that attach directly to the backs of those modules. That means soldering: you wire the daughter boards to the Behringer jack sockets yourself. No traces need to be cut because the jack sockets aren't normalised, so the mod is reversible. It's still not for the timid. This is gear for the tinkerer and the Moog purist who wants a System 55 to respond like a 1968 console, not a 2020s reinterpretation.
This is not a vintage piece, and it doesn't pretend to be. The AM993 is a modern recreation, born decades after the original. It doesn't just mimic the function of the Moog 993. It replicates the signal path logic, particularly around S-trigger implementation, which is critical for accurate Moog timing behavior. It doesn't generate sound, but it changes how the system feels: tighter, more responsive, more "Moog."
Specifications
| Manufacturer | AMSynths |
| Product type | Eurorack Module |
| Dimensions | 8 HP, 35 mm deep |
| Current Draw | 11 mA +12V, 11 mA -12V, 0 mA 5V |
| Price | $125 |
| Power | PCB has a 12V power inlet socket |
| Components | Has eight slide switches and LED’s |
| Connectivity | Connects to the 902, 911 and 911A via an included cable harness that uses Molex 2 and 3 pin connectors |
| Panel material | Black anodised aluminum |
| Included accessories | Power cable and black hex M3 screws are included |
| Production status | AM993 Mark 1 is obsolete |
Key Features
Moog 993 Logic, Modern Panel
The AM993 is a functional recreation of the Moog 993. The original 1968 module routed triggers and envelope control signals in the Moog modular systems, and this module brings that same logic to the Behringer 55. The eight slide switches on the front panel, each with a red LED, are the user interface. When a switch is engaged and lit, it routes trigger outputs "from 1" or "from 2" to the 911A Dual Trigger Delay, mimicking the original signal flow. It's a direct signal path replication.
Behind-the-Scenes Wiring with Daughter PCBs
The real work happens off the front panel. A small daughter PCB attaches to the back of each 902, 911, and 911A module. These boards don't replace anything. They interface. Molex connectors carry signals between the AM993 and the daughter boards, but the final link - soldering wires from the daughter PCBs to the Behringer jack sockets - is left to the user. That's by design. It keeps the Behringer modules unmodified (since the sockets aren't normalised), making the install reversible. It also means you need a steady hand and a decent iron.
S-Trigger Ready, V-Trigger Convertible
Moog timing depends on S-triggers (short for "series trigger"), which are current-based and faster than the more common V-triggers (voltage triggers). The AMSynths AM993 has S-trigger inputs, making it compatible with vintage-style timing. The Mark 2 version adds on-board V-trigger to S-trigger conversion. You can feed it standard V-triggers from modern gear and it translates them into the Moog-compatible S-trigger format, with no external converter needed. If you're using the Mark 1, the AM997 Dual Trigger Converter was designed specifically to work with it.
Designed for the System 55, Built for Tinkerers
The AM993 doesn't try to be universal. It's aimed at the Behringer System 55, for those who want it to behave like a true Moog. The black anodised aluminum panel matches the System 55 modules, and the 8HP width keeps it compact. It's listed under the "Modular III" product family on the AMSynths site, in a section titled "Behringer." It's listed among 61 models in the AMSynths archive.
Mark 1 vs. Mark 2: A Quiet Evolution
The AM993 Mark 1 is now obsolete. The Mark 2 improves on it with on-board V-to-S trigger conversion, reducing the need for additional modules. It also reportedly works well with the AM-CP1 module. The core function is unchanged: routing triggers and envelope control signals with the same logic as the 1968 Moog original. The AM997's internal connections were designed to work with the AM993 Mark 1.
Historical Context
The AM993 exists because of the Behringer System 55. When Behringer launched their recreation of the classic Moog modular, many users wanted more than the sound. They wanted the behavior and the timing. The original Moog 993 module managed trigger distribution and envelope control in the 1968 system. AMSynths made a module that replicates that functionality for the modern recreation. The AM997 Dual Trigger Converter was designed with the AM993 Mark 1 in mind.
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