ALM BXx2 (2023)

Name: ALM BXx2
Brand: ALM

Two channels of vintage-mixed grit, EQ, and saturation in 8HP—like finding a Boss BX in a time capsule and stuffing it into your Eurorack.

Overview

Plug a dry kick into the ALM BXx2, crank the gain, then back it off with the level knob, and suddenly it’s not just louder—it’s meaner. There’s a thickness, a kind of chewy saturation that doesn’t just clip the signal but seems to reorganize its molecules, giving it presence in a mix the way a well-worn leather jacket gives presence to a silhouette. This isn’t clean gain staging; this is character injection. The BXx2 doesn’t just mix—it styles. And if you’ve ever chased that raw, midrange-forward, slightly unstable drum sound that defined early Chicago house or Detroit techno, this module is less a tool and more a time machine.

Based on the cult-favorite Boss BX series mixers—specifically the single-channel PRE BX from Feedback Modules—the BXx2 distills that legacy into a dual-channel Eurorack format. It’s not a full recreation, but a reinterpretation: two channels of preamp, EQ, and mix circuitry, each with its own input gain and output level controls, letting you push the front end into glorious overdrive while taming the output to fit your mix. That dual-control setup is key. It means you can slam the input for harmonic saturation, then pull the level back to avoid clipping downstream—giving you control over both the amount of color and the volume of the result. And because each channel has its own high and low shelf EQ, you’re not just distorting blindly—you’re shaping the tone of the distortion itself, boosting lows to fatten a snare or cutting highs to keep a hi-hat from turning into digital shrapnel.

Despite its compact 8HP footprint, the BXx2 feels substantial in use. The layout is clean, almost utilitarian: two identical channels, each with Gain, Level, Low EQ, and High EQ knobs, plus an Aux input that sums an external source at -6dB. The mix output combines both channels and the Aux input, making it easy to chain multiple BXx2s or integrate with another mixer. It’s not a full-featured console, but it’s not trying to be. It’s a flavor unit—a sonic seasoning rack for your rack. And while it lacks individual channel outputs (a notable omission for stereo patching), that limitation keeps the focus on its strength: adding cohesive, analog-style color to grouped signals, especially drums.

Specifications

Manufacturer	ALM Busy Circuits
Production Years	2023
Model Number	ALM043
Module Type	Dual Channel Preamp, EQ, Mixer
HP Size	8
Depth	32mm
Power Supply	±12V
+12V Current Draw	10mA
-12V Current Draw	10mA
5V Current Draw	Not specified
Inputs	2x Channel Inputs, 1x Aux Input
Outputs	1x Mix Output
EQ Type	Per-channel High and Low Shelf EQ
Aux Input Gain	-6dB
Reverse Power Protection	Yes
Manufacturing Origin	England
Original Price	$189 USD
Status	Discontinued

Key Features

Gain-Into-Level Saturation Circuitry

The heart of the BXx2’s magic lies in its per-channel gain and level controls. Unlike a simple overdrive pedal or a fixed-gain preamp, this dual-knob setup lets you sculpt the saturation independently from the output volume. Turn up the Gain, and the input stage begins to compress and distort in a way that feels organic—slightly uneven, harmonically rich, with a soft clipping that doesn’t flatten transients. Then, use the Level knob to bring it back down to line level without losing the newly added body. This is the same technique engineers used on vintage consoles: hit the preamp hard, then attenuate after. The BXx2 makes that workflow accessible in modular form, and it’s devastatingly effective on drum sources. A thin 808 kick gains chest cavity. A lifeless clap turns into a crackling spark. It’s not just louder—it’s more real.

Simple but Musical EQ per Channel

The EQ section isn’t surgical—it’s musical. Each channel gets a high shelf and a low shelf, with no frequency selection, just boost/cut. That might sound limiting, but in practice, it’s liberating. You’re not fine-tuning; you’re feeling. Crank the low shelf on a kick and it swells like a tire inflating. Pull back the highs on a distorted snare and it stops fighting the cymbals. The EQ interacts with the gain stage in subtle ways—pushing the lows into overdrive creates a kind of sub-harmonic grumble, while boosting highs before saturation can introduce a fizzy, tape-like top end. It’s not a parametric EQ, and it’s not meant to be. It’s a tone shaper, designed to work with the distortion, not around it.

Limited Run, Collaborative Design

The BXx2 wasn’t built to stick around. With only 300 units produced, it’s a deliberate limited release, developed in collaboration with Feedback Modules, the creators of the original PRE BX. This isn’t ALM chasing mass market appeal—it’s a niche product for a specific sound. The fact that it’s based on a boutique module that itself pays homage to a forgotten Boss mixer tells you everything: this is gear for people who care about lineage, about the chain of influence from 1980s drum machines through 1990s techno studios and into today’s modular rigs. It’s also made in England, which may not affect the sound, but signals a commitment to quality control and small-batch production. When you own a BXx2, you’re not just buying a module—you’re joining a conversation.

Historical Context

The BXx2 exists because of a very specific sonic nostalgia. The original Boss BX mixers—compact, battery-powered, and built like lunchboxes—were never high-end studio gear. But their preamps had a character: gritty, mid-forward, and slightly unstable under load. In the hands of producers working with early drum machines like the Roland TR-808, TR-909, and Oberheim DMX, that character became a feature. Engineers would run drum outputs through the BX to add punch and presence, often overdriving the inputs for that compressed, saturated tone. The result? The raw, unpolished drum sound that defined early techno, acid, and Chicago house. Green Velvet’s “La La Land” is practically a BX demo track.

Fast forward to the 2020s, and that sound is more desirable than ever. But original BX mixers are rare, finicky, and not exactly Eurorack-friendly. Feedback Modules filled the gap with the PRE BX, a single-channel Eurorack take on the circuit. ALM’s BXx2 expands on that idea, offering two channels in a skiff-friendly format. It’s part of a broader trend in modular synthesis: not just recreating vintage sounds, but preserving them. In an era where digital emulations can perfectly model circuits, the BXx2 stands out by being analog, limited, and tactile. It doesn’t try to be everything—it tries to be that.

Collectibility & Value

The BXx2 is already a collector’s item—not because it’s rare for rarity’s sake, but because it delivers a specific, sought-after sound in a compact format. With only 300 units made and official discontinuation confirmed, the used market is the only place to find one. As of 2026, prices range from $180 to $250, depending on condition and seller. Units in mint condition with original packaging can command the higher end, especially if sold through trusted modular retailers or forums.

There are no known failure points specific to the BXx2—its circuit is simple, with no complex ICs or delicate components. The 32mm depth makes it skiff-friendly, and reverse power protection adds a layer of safety for beginners. However, because it’s based on a discrete preamp design, it’s sensitive to power supply noise. Users report best results when paired with high-quality bus boards and clean power supplies. There are no firmware updates or serviceable parts, so if a unit fails, repair requires component-level troubleshooting.

Buying advice: test the gain structure before purchasing. A genuine BXx2 should show clear saturation when gain is high and level is low, with no crackling or dropouts. Check that the Aux input sums correctly and that the mix output isn’t noisy at idle. Because it’s discontinued, there’s no waiting for a reissue—what’s out there is all there is. If you see one at a fair price, and you work with drums or want analog color, it’s worth grabbing. But if you need individual outputs or stereo processing, look elsewhere—the BXx2 is a color mixer, not a routing hub.