Mod Devices MOD Duo X

The MOD Duo X is a standalone audio processor from German maker MOD Devices, announced in 2018 as a more powerful version of the company's MOD Duo¹. Where a typical multi-effects pedal sits on the floor and processes guitar, the Duo X is a desktop unit that hosts multi FX, virtual instruments, MIDI tools and CV utilities in one box². MOD Devices pitched it at players and producers working in the studio, electronic music production and performance, and DJing³.

Under the hood it is a digital device: a purpose-built, Linux-based hardware plugin host with its own ecosystem that runs audio and MIDI manipulation modules⁴, built around a standalone NXP i.MX8M quad-core ARM Cortex-A53, 1.5GHz audio processor¹. The firmware is Linux-based and its status is outlined on two graphical displays⁵. It is a stereo unit⁶, with independent audio I/O that can run stereo or dual mono, a preamp per channel and a master volume control².

A standalone audio processor on the desktop

The Duo X's defining feature is that it does not need a computer to make sound. Gearnews described it as a desktop-format unit with fully standalone functionality, targeting electronic musicians⁵, and Delicious Audio called it a standalone audio processor containing an array of effects, virtual instruments and MIDI utilities³. Like the original MOD Duo, it has completely independent audio I/O⁷, so it runs its pedalboards on its own processor with its own audio connections.

For a player, that means the Duo X behaves more like a small studio hub than a stompbox. Bass Gear Magazine's reviewer, Sean Fairchild, noted that it is "markedly more refined and more suited to the desktop than underfoot, with its soft, MPC-style button actuators"⁴. Performer Mag's Chris Devine confirmed it is a stereo unit⁶.

Editing is where the computer comes in. As Performer Mag put it, you "connect it to a computer via USB, and start up a browser", and it is ready to go⁶. The unit itself keeps running standalone once your pedalboard is loaded.

The controls: encoders, pots, pads and buttons

The Duo X's control surface is what separates it from the floor-mounted MOD Duo. Per the maker, it carries⁴⁶²:

• 2 rotary encoders
• 8 potentiometers
• 4 push-buttons
• All fully assignable²

Gearnews listed the same set as two encoders, eight potentiometers and four pads, all freely assignable⁵, and Delicious Audio added six push buttons with instant setting recall and alternation capabilities, plus a pagination system for reaching more parameters than the surface shows at once³.

Like the previous MOD Duo, there are two large display screens, which show which control is assigned to which parameter and respond in real time⁶. The original Duo took a simpler approach: two multi-function knobs to which any parameters can be assigned, stacking several controls per knob with a push⁷. The Duo X's extra real-time control was the point of the upgrade, as Performer Mag noted: "Now comes the Mod Duo X, adding in some extra real time control"⁶.

MIDI, USB and outputs

The Duo X is well connected for a desktop unit. The maker lists classic MIDI I/O and a USB-device port for computer connection², and Gearnews confirmed MIDI I/O is also possible over USB⁵. Delicious Audio reported it supports numerous MIDI controllers operating at the same time, with MIDI Slave Sync and Stereo Link³. The original MOD Duo likewise offered full MIDI support, both legacy DIN and USB⁷.

Audio-wise, the Duo X offers independent audio I/O, stereo or dual mono, with a preamp per channel and a master volume control², plus a headphone out with a dedicated volume control². The MOD Duo also carried a headphone output with independent digital volume control⁸.

What reviewers made of it

Coverage of the MOD Duo X while it was new focused on its availability and its interface rather than verdicts. The unit was available for pre-order at the time⁵, and its control surface includes a pagination system for organizing and reaching its functions⁵³.

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