ADDAC System ADDAC111 (2018–Present)

The Eurorack workhorse that turns your SD card into a tactile, voltage-controlled sampler with surgical precision and just enough quirks to keep you honest.

Overview

You plug in a micro SD card, hit reset, and suddenly your modular rig is speaking in found sounds, field recordings, or glitchy percussion loops you loaded up last night—this is the quiet magic of the ADDAC111. It doesn’t try to be a full sampler or a granular mangle machine; instead, it carves its niche as a no-nonsense, deeply controllable playback engine for .WAV files, built like a tank and wired for war. The original ADDAC101 was already respected, but the 111 is the one that finally gave patchers what they’d been asking for: dedicated front-panel controls for loop start, loop size, sample rate, and file navigation, all with CV inputs that don’t force you to patch through external attenuators just to get basic functionality. It’s not flashy, but in a system where every knob and jack matters, this kind of thoughtful refinement feels like breathing room.

What really sets the 111 apart isn’t just that it plays .WAVs—it’s how much control you have over the playback process without needing a second module just to manage it. Want to sweep the playback speed from sub-audio warble to chipmunk frenzy using a slow LFO? The 1v/oct sample rate input handles that cleanly across a ±4 octave range. Need to jump between files via sequencer triggers? The dedicated forward/backward gate inputs make that trivial. And if you’re into live performance, the loop point function—where you press a button to set start and end points on the fly, like a DJ’s cue loop—adds a layer of spontaneity that few other digital playback modules offer. It’s not a full-fledged sampler with recording capability, but it doesn’t pretend to be. It’s a playback module with surgical precision, and in that narrow role, it excels.

But let’s be real: this thing demands respect for file management. It won’t read your .mp3s, it won’t auto-detect sample rates, and if you name your files “kick_01.wav” instead of “a.wav,” it will stare at you blankly and light up the ERROR LED like a rebuke. The naming convention is rigid—A through Z, then 0 through 9—and while that feels archaic in 2026, it’s part of the module’s charm and reliability. Once you fall into the rhythm of prepping cards properly, it becomes second nature. And yes, you’ll curse the first time you forget to clean hidden OSX files off your card and spend 20 minutes troubleshooting why the ERROR LED won’t turn off—but that’s part of the ritual. This isn’t plug-and-play; it’s a module for people who like to know exactly what their gear is doing, down to the filesystem level.

Specifications

Key Features

Loop Points That Feel Like Performance Tools

Most digital playback modules in Eurorack treat looping as a static setting—you define start and end points in software or via menu diving. The ADDAC111 flips that by putting loop point assignment directly under your fingers. Press the “Loop Pt” button once to set the start, press it again to set the end and engage the loop. It’s immediate, tactile, and perfect for live sets where you want to isolate a fragment of audio on the fly. The loop state can be toggled via front-panel switch or CV, and the loop size and start point each have their own attenuated CV inputs, so you can modulate the length of a loop with an envelope or shift the playback window with a random voltage. This isn’t just playback—it’s real-time manipulation, and it brings a DJ-like fluidity to modular performance that few other modules match.

Micro SD for Depth, Not Just Convenience

The switch from full-size SD to micro SD in the 111 wasn’t just about modernizing the hardware—it was a deliberate design choice to keep the module’s depth down to a svelte 3 cm. That makes it skiff-friendly and ideal for compact systems where every millimeter counts. But it also means you’re dealing with a finicky little card slot that doesn’t love rough handling. Owners report that repeatedly swapping cards can wear out the socket over time, and cheap micro SD cards are notorious for failing in the field. The solution? Use a high-quality, name-brand card (SanDisk, Samsung), dedicate it solely to the 111, and avoid hot-swapping unless absolutely necessary. There’s no battery backup or file caching—what’s on the card is what you get, the moment you press reset.

Expansion That Turns Files Into Sequences

The ADDAC111B expansion module is where this unit stops being a smart player and starts feeling like a full compositional tool. By adding trigger inputs for the first eight files on the card, the 111B lets you sequence entire sets of samples using a simple clock and logic module. Imagine triggering a different vocal snippet, drum hit, or ambient texture with each step of a sequence—no MIDI, no computer, just pure voltage control. It’s a game-changer for live sets and generative patches, and while the base 111 works fine without it, the B module reveals the full potential of the system. That said, it’s a separate purchase, adds another 8 HP, and requires its own power connection, so it’s not for casual users. But for those building a sample-based performance rig, it’s essential.

Historical Context

When the ADDAC101 launched, it was one of the first Eurorack modules to offer straightforward .WAV file playback without requiring a computer in the loop. At a time when most digital modules were either obscure DIY projects or overly complex samplers with steep learning curves, the 101 stood out for its simplicity. But users quickly hit limitations—lack of front-panel loop controls, no 1v/oct sample rate, and minimal CV integration. The ADDAC111, released around 2018, was the direct response to years of user feedback. It arrived during a boom in hybrid modular setups, where performers were blending acoustic sources, field recordings, and precomposed audio with analog synthesis. Competitors like the Critter & Guitari Organelle or the Teenage Engineering OP-1 offered more features but lacked the deep voltage control that modular users craved. The 111 filled that gap: not a standalone instrument, but a precise, embeddable audio engine that spoke the language of CV and gates fluently. It wasn’t trying to replace a sampler—it was trying to make audio playback feel like a native part of the modular experience.

Collectibility & Value

The ADDAC111 isn’t a vintage item in the traditional sense—it’s still in production, and ADDAC System maintains active support, firmware updates, and even offers custom faceplates in a range of colors (for a €75 premium and a 4–6 week wait). That means it doesn’t trade like a rare Roland or a discontinued Moog. But it has quietly become a staple in serious Eurorack builds, especially among experimental and live-performance users. Used units typically sell between $250 and $350, depending on condition and whether they include the ADDAC111B expansion. Mint units with original packaging and firmware updated to E0 (February 2018) command a slight premium, but the module is robust enough that well-maintained used examples perform identically to new ones.

The biggest failure points are mechanical: the micro SD card slot and the front-panel buttons. The card slot, being surface-mounted and tiny, can crack or desolder if a card is inserted at an angle or forced. Button switches, while high-quality, can develop crackles over time, especially if used aggressively in live sets. Power issues are rare, but technicians note that older units with frayed ribbon cables should be inspected—ADDAC uses standard Doepfer-style 8×2 IDC connectors, so replacements are easy, but a loose connection can cause intermittent resets or audio glitches.

If you’re buying used, test every CV input and output with a multimeter if possible. Verify that the firmware is up to date (E0 is current), and ask the seller if they’ve experienced any SD card read errors. Bring your own pre-formatted card (FAT16, files named a.wav, b.wav) to test on the spot. And if the ERROR LED stays lit or blinks four times without turning off, something’s wrong—either the card isn’t clean, the files are misnamed, or the module has a deeper issue. This isn’t a module that hides its problems; it tells you exactly what’s wrong, which is both a blessing and a reminder that it demands care.

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