ALM mmT (2019–)

Eight triggers, one cable. The mmT turns a MIDI controller into a Eurorack trigger source.

Overview

The ALM mmT has no blinking lights, no knobs and no patch points. It is a 3HP sliver of brushed aluminum with a grid of eight labeled outputs and a single ribbon cable running back to the mmMIDI. Plug it in, hit a key on your keyboard, and the modular starts twitching: kick drum fires, snare snaps, hats scatter, all without a patch cable from your controller. It isn't a synth and it isn't a processor. It translates MIDI note data into voltage spikes for Eurorack. Anyone who has repatched a drum sequence because they changed the tempo in their DAW will see the appeal.

The mmT is built as an expander for the mmMIDI and doesn't work on its own. It adds eight assignable gate/trigger outputs that respond to note-on messages on a dedicated MIDI channel. The notes are printed right on the panel, C1 through G#1, so there are no menus and no cheat sheets. Hit C1 and you get a +5V gate out of the top-left jack. Hit D1 and the next one down fires. Other MIDI-to-CV units offer arpeggiators, scales or complex mapping. The mmT turns keys into gates and that's all. No velocity processing, no retriggering logic, no swing. What you send is what you get. Often that's enough: a kick on C1, a snare on D1, a hat on E1, with millisecond timing and rock-solid reliability.

It fits the ecosystem ALM built around the mmMIDI: minimal setup, near-instant integration, and little to get in your way. There's no firmware to update on the expander and no configuration beyond setting your MIDI channel on the mmMIDI. It draws power through the ribbon cable, so there's no second power header to deal with. It's passive in every meaningful sense, so there's almost nothing to go wrong. No microcontroller to freeze, no DACs to drift. Just eight opto-isolated outputs that fire when told.

Specifications

Manufacturer	ALM Co Ltd (Busy Circuits)
Production Years	2019–
Original Price	£95 GBP / $125 USD
Module Type	MIDI-to-Gate Expander
HP Width	3
Depth	38mm
Power Requirements	Powered via ribbon cable from mmMIDI (no direct power connection)
Input	Direct connection to mmMIDI expansion port via supplied ribbon cable
Outputs	8x 3.5mm gate/trigger outputs (labeled C1 to G#1)
Output Signal	+5V gate (nominal)
MIDI Channels	1 dedicated channel (configurable via mmMIDI)
Note Mapping	Fixed: C1, C#1, D1, D#1, E1, F1, F#1, G#1
Isolation	Opto-isolated outputs
Compatibility	Requires ALM mmMIDI module
Weight	Approx. 80g
Mounting	Standard Eurorack 3U panel, M3 screws
Country of Origin	England
Warranty	2 years

Key Features

Fixed Note-to-Gate Mapping

The mmT doesn't let you remap its keys. What's printed on the panel is what you get: eight consecutive MIDI notes from C1 to G#1, each tied to a single output. That means no configuration headaches and no forgotten mappings when you return to a patch after a week. It also means no firmware quirks and no hidden modes. If your DAW sends a note-on for D1, the second output fires. This suits drum triggering, where consistency matters more than flexibility. Load up a drum plugin on eight MIDI tracks, assign each to the right note, and you have a hardware trigger interface that's faster to use than most dedicated drum modules.

Opto-Isolated Outputs

Each of the eight outputs is opto-isolated, so there's no electrical continuity between the mmT's circuitry and your modular's. That's a safety measure, and it also prevents ground loops and noise injection, especially when driving modules from different power supplies or cases. In practice, you can daisy-chain clocks, trigger finicky vintage-style envelopes, or fire sample-and-hold circuits without voltage spikes sneaking back into the mmMIDI. Other expanders might offer more outputs or assignable notes, but few consider what happens when a 16th-note hi-hat sequence starts crosstalking into a sensitive VCO.

Expansion-Only Architecture

The mmT is physically and electrically dependent on the mmMIDI. It connects via a short ribbon cable that plugs into the host module's rear expansion header. This keeps the design lean, with no redundant power regulation and no duplicate MIDI parsing, and it ensures tight timing between the mmMIDI's CV outputs and the mmT's gates. There's no way to use it as a standalone gate distributor or clock divider. It exists only to extend the mmMIDI's functionality, which limits its appeal to non-mmMIDI owners. For those already in the ecosystem, it's an easy upgrade: no extra cables, no additional USB or DIN MIDI jacks, no second module hogging HP.

Historical Context

The mmT arrived in late 2019, when Eurorack was deep in a "MIDI renaissance." After years of purist analog worship, modular users were embracing digital integration as a tool, not a compromise. Devices like the Korg SQ-64, Arturia BeatStep Pro, and Ableton Push were becoming central to live and studio setups, and manually patching CV and gate for every note was no longer sustainable. The market responded with smarter MIDI-to-CV interfaces: Kenton's Pro Solo, Expert Sleepers' FH-2, and Mutable Instruments' Yarns offered deep sequencing, polyphony, and bidirectional sync. ALM took a different path. Instead of building a Swiss Army knife, they made a scalpel. The mmMIDI, and by extension the mmT, was designed for immediacy: plug in, set two channels, and go. It wasn't for composers writing polyphonic leads or complex arpeggios. It was for producers who wanted to play a bassline on a keyboard while keeping one hand on a filter cutoff, or drummers who wanted to trigger samples without leaving their MIDI pads. The mmT offered not more features, but more triggers.

Its closest competitors weren't other expanders, which didn't really exist, but full standalone modules like the Intellijel Steppy or the Doepfer A-190-3. Those offered more flexibility, but also required more setup, more patching, and more HP. The mmT's niche was clear: if you already owned an mmMIDI and wanted more trigger outputs, this was the only logical choice. It was solving a specific problem for a specific user.

Collectibility & Value

The mmT isn't a collector's item in the traditional sense. It's a utilitarian add-on, and the market reflects that. New units list between $95 and $125, depending on region and stockist, while used examples trade for $75 to $90 on Reverb or ModWiggler's market. There's no significant price inflation and no scalper markup, just steady demand from users expanding their mmMIDI rigs.

Failures are rare, but not nonexistent. The most common issue is physical damage to the ribbon cable connector, especially if the mmT is frequently removed from a case. The socket is surface-mounted and can be strained by repeated insertion, potentially leading to intermittent connection or complete failure. Some users report loose mounting screws over time, likely due to case vibration during transport. There are no user-serviceable parts, and no known firmware or calibration adjustments, so if it works when you buy it, it'll likely keep working. No batch-specific defects or recall notices have been documented.

When buying used, verify that all eight outputs fire consistently. A simple test with a multimeter or LED-equipped module can catch dead channels early. Also check the ribbon cable for fraying or bent pins. The mmT is useless without the mmMIDI, so make sure the seller isn't bundling it as a "complete MIDI solution." It's just the expansion half.