ADDAC 200PI (2015–)

A tiny gateway between your modular world and a pedalboard full of sonic chaos — and it doesn’t hog your rack space doing it.

Overview

You know that moment when your Eurorack system starts feeling too clean, too precise, too… polite? That’s when you start eyeing the pedalboard like a secret portal to madness. The ADDAC 200PI is the unassuming key to that door — a 4 HP sliver of circuitry that lets you weave two separate chains of guitar pedals into your modular rig without breaking a sweat or a power supply. It doesn’t make sound. It doesn’t shape it directly. But it enables something far more valuable: freedom. Freedom to run a synth output through a vintage flanger, a ring modulator, or a fuzz pedal that’s been sitting unused since 2003, then bring that mangled signal back into your patch at line level, ready to be filtered, sequenced, or fed into a reverb. And it does it twice, independently, so you can process two signals — say, a bass oscillator and a lead — through completely different pedal chains.

This isn’t a module for purists who believe modular should stay self-contained. It’s for the tinkerers, the pedal hoarders, the ones who still have a Boss CE-1 in the closet and dream of hearing it wobble over a 24dB/octave sweep. The 200PI doesn’t just accept external effects — it normalizes them, making them feel like native parts of your system. The send outputs attenuate the modular’s line-level signal down to instrument level, so your pedals don’t get overloaded. The returns then boost the pedal’s output back up to modular-friendly levels, avoiding the dreaded volume drop that plagues DIY send/return attempts. It’s simple, it’s smart, and it solves a real problem with surgical precision.

And it does all this in just 4 HP — a width that borders on absurdly economical in a format where mute buttons take up 6 HP. At 30 mm deep, it’s not exactly shallow, but it’s not a rack-breaker either. The power draw is negligible: 10 mA on both +12V and -12V, zero from 5V. You could populate an entire row of these and barely make your power supply blink. That’s part of its charm — it’s the anti-bottleneck. No CV control, no fancy switching, no digital brains. Just sends, returns, and the quiet confidence of a module that knows its job and does it well.

Specifications

Manufacturer	ADDAC System
Production Years	2015–
Original Price	100.00 € (kit: 64 €)
Width	4 HP
Depth	30 mm
Power Consumption	10 mA +12V
Power Consumption	10 mA -12V
Power Consumption	0 mA 5V
Signal Path	Analog
Channels	2
Send Outputs	2 x 3.5 mm (1/8"), 2 x 6.35 mm (1/4")
Return Inputs	2 x 3.5 mm (1/8"), 2 x 6.35 mm (1/4")
Send Function	Attenuates modular line level to instrument level
Return Function	Amplifies instrument level to modular line level
DIY Availability	Yes, full kit available
Custom Panel Options	Red, Green, Blue, White, Silver Gray, Yellowed Silver, Dark/Light Bronze
Print Color Options	Black, White, Red, Yellow, Blue, Green
Country of Origin	Portugal

Key Features

Dual Independent Pedal Loops

Two isn’t just better than one — it’s transformative. With two completely separate send/return channels, the 200PI lets you treat different parts of your modular setup with entirely different pedal chains. Imagine sending your drum outputs through a vintage analog delay while routing your melodic sequences through a granular pedal or a pitch-shifter. Or use one channel for time-based effects and the other for distortion and filtering. The independence means no crosstalk, no compromise. Each loop is electrically isolated, so grounding issues and hum are minimized. And because both sends and returns come with both 3.5 mm and 6.35 mm jacks, you can plug in Eurorack cables or standard guitar patch cables without adapters. It’s a small thing, but in the middle of a session, not having to dig for a converter is a gift.

Level Matching That Just Works

The magic isn’t in the routing — it’s in the level shifting. Modular synths operate at line level, typically around ±5V, while guitar pedals expect instrument level, usually around -10 dBV. Plug a modular output straight into a pedal, and you risk distortion, clipping, or even damage. Bring the pedal’s output back without boosting it, and it’ll get drowned in the mix. The 200PI handles both steps transparently. The send side attenuates the signal cleanly, preserving dynamics and frequency response. The return side applies just enough gain to bring the signal back up without adding noise or coloration. It’s not a preamp, it’s not a compressor — it’s a translator, making two different audio worlds understand each other. And it does it with near-invisible fidelity. There’s no noticeable hiss, no low-end roll-off, no phase weirdness. It just sounds like your pedals, only properly integrated.

DIY-Friendly Design and Custom Panels

ADDAC doesn’t just sell the 200PI as a finished module — they offer it as a DIY kit for 64 € (excluding VAT), which is a rare and welcome nod to the builder community. The assembly guide is thorough, well-illustrated, and available as a free PDF. For those who enjoy soldering but don’t want to design from scratch, it’s an ideal entry point. And for those who care about aesthetics, ADDAC offers custom front panels in a range of colors — not just black. Want a bright red 200PI to match your synth’s accent theme? Done. A silver-gray panel with blue text for a retro-futuristic look? Also doable. It’s not just cosmetic; it’s a way to personalize a utility module that could otherwise fade into the background. The lead time is 4–6 weeks, and the cost is extra, but for collectors and visual stylists, it’s worth the wait.

Historical Context

The 200PI arrived in 2015, right as Eurorack was shifting from niche curiosity to widespread adoption. Modular systems were growing larger, more complex, and — for some — a little too insular. A generation of musicians who had spent years building pedalboards were now diving into racks, but they didn’t want to abandon their old gear. The 200PI answered that tension perfectly. It wasn’t the first send/return module — Doepfer’s A-138d existed years earlier — but it was one of the first to prioritize space efficiency and dual-channel independence in such a compact footprint. At a time when 8 HP mixers and 12 HP sequencers were standard, a 4 HP utility that solved a real-world integration problem stood out.

ADDAC, based in Lisbon, had already built a reputation for thoughtful, musician-first design. Their modules often straddled the line between utility and expression — not just tools, but enablers of new workflows. The 200PI fit that philosophy exactly. It didn’t try to be flashy. It didn’t add synthesis or modulation. It simply removed a barrier. Competitors like Intellijel and Make Noise focused on core sound generation and modulation; ADDAC carved out a niche in the connective tissue — the CV processors, the analog utilities, the modules that make the system breathe. The 200PI wasn’t a flagship, but it became a staple — the kind of module that shows up in rack photos again and again, quietly doing its job.

Collectibility & Value

The ADDAC 200PI isn’t a rare bird, but it’s not disposable either. Since it’s still in production, it’s not a vintage artifact in the traditional sense — but it has aged into a modern classic. Used units typically sell between $75 and $110, depending on condition and whether they include the original packaging or any custom panel work. New units list around $130–$140, with slight variations between dealers. The DIY kit remains available directly from ADDAC, making it one of the more accessible entry points into their ecosystem.

Failures are rare, but not unheard of. Service technicians observe that the most common issue is jack wear — particularly on the 6.35 mm connectors, which see frequent plugging and unplugging. Since the module uses both 3.5 mm and 6.35 mm jacks in parallel, a loose or noisy 1/4" jack can sometimes affect the 1/8" connection. There are no active components that degrade over time — no electrolytic capacitors to dry out, no op-amps prone to failure — so long-term reliability is high. The biggest risk is physical: the depth (30 mm) means it can interfere with back-mounted power cables or adjacent modules in tightly packed cases. Always check clearance before installing.

For buyers, the advice is simple: inspect the jacks for wiggle or crackling, test both send and return paths with known-good cables, and verify that the level shifting works as expected (i.e., no volume drop on return). If buying used, ask whether the module has been modified or if the panel is custom — some users paint or replace panels, which can affect resale value. And if you’re building a rack from scratch, consider getting the DIY kit — it’s a satisfying build, and you’ll understand the module better once it’s in your system.