ADDAC System ADDAC200PI (2015–)

Two channels of pedal integration squeezed into 4HP - the connection between rack and stompbox

Overview

Plug in a vintage phaser, a battered analog delay, or a screaming overdrive, and this brushed aluminum slab works as your Eurorack system's translator. It takes synth-level signals down to instrument-level for pedals, then brings them back up without noise or fuss. The ADDAC200PI doesn't make sound, and it doesn't shape it in new directions. Pull it from the rack and the setup feels disconnected, like a phone call dropped mid-sentence. ADDAC System built it during its mid-era push into hybrid utility design, and the 200PI landed in 2015. More modular users were running external effects, but few modules handled impedance and level translation cleanly across two chains. This was not a send/return with jacks slapped on. It was engineered with signal integrity in mind.

At 4HP, it's barely wider than a power cable, yet it fits two complete, independent pedal loops. Each has both 3.5mm and 6.3mm (1/8" and 1/4") jacks. That dual-jack design suits pedalboards where cables are mismatched and adapters get lost. No repatching, no adapters cluttering your case. The send side attenuates the typically hotter Eurorack output down to instrument level, and the return path has a clean gain stage to bring the signal back up to modular levels. Unlike send/return modules that just passively route, the 200PI uses active circuitry built around a TL072 op-amp. It's a common chip, but it was chosen here for low noise and reliability in buffering. There's no level control, no mute and no CV modulation - just two lanes of transparent signal transit. If you want to tweak send levels or automate returns, look elsewhere. If you want to plug in an Electro-Harmonix Memory Man and have it behave as if it's connected to a guitar amp, this does it.

The ADDAC200PI sits between the bare-bones send/returns and the more feature-rich integrators like ALM's own SBG. It's more flexible than a passive loop and less complicated than a full FX host. It doesn't compete with modules that offer level pots or CV control. It's the module you reach for when you're tired of jerry-rigging pedal integration with attenuators and mixers. You install it once and forget about it, which is high praise for a utility module.

Specifications

Manufacturer	ADDAC System
Production Years	2015–
Original Price	$134
Module Type	Dual Pedal Integrator
HP	4
Depth	30 mm
Current Draw +12V	10 mA
Current Draw -12V	10 mA
Current Draw +5V	0 mA
Inputs	2x Send (3.5mm and 6.3mm)
Outputs	2x Return (3.5mm and 6.3mm)
Signal Path	Active, buffered
Op-Amp	TL072
Impedance Matching	Send: Eurorack to instrument level, Return: instrument to Eurorack level
Channels	2 independent
Weight	Not specified
Dimensions	4HP x 30mm depth
Mounting Hole Spacing	32.5 mm

Key Features

Bilingual Jacks for Seamless Integration

Having both 3.5mm and 6.3mm jacks on each channel is a design choice. Eurorack runs on 3.5mm, but pedals use 6.3mm. Many integrators force you into one or the other, with adapters or custom cables. On the 200PI you can run one channel with patch cables to a nearby delay and the other with a proper 1/4” cable to a pedalboard under your rack. No breakout boxes, and no signal degradation from daisy-chained adapters. In a live setup or a cramped case, that saved cable clutter adds up. The jacks are mounted directly to the PCB, which keeps the module slim. Long-term durability under heavy cable strain hasn't been widely tested. Owners report no widespread failures, but techs recommend securing cables to avoid leverage on the board.

Active Signal Conditioning with TL072

The transparency of the 200PI comes from the TL072 dual JFET-input op-amp. The chip is a workhorse, found in everything from vintage Neve preamps to Doepfer modules. Here it buffers and scales signals without coloring them. The send path attenuates the typical ±5V to ±10V Eurorack output down to the ~1V peak-to-peak expected by guitar pedals. The return path amplifies the weaker pedal output back to modular levels. The TL072 has high input impedance and low output impedance, so it prevents the loading that can dull tone when modular gear connects directly to pedals. It's not a "colored" stage. There's no harmonic saturation and no soft clipping, just clean gain. If you want your Space Echo to sound like your Space Echo, and not like your Space Echo run through a murky buffer, this does that. Some users report slight channel imbalance at extreme levels. Within normal operating range, the response is flat and reliable.

Compact Dual-Channel Architecture

Two independent channels in 4HP is dense. Most dual send/returns occupy 6HP or more. The 200PI gets its footprint by minimizing front-panel space: no knobs, no switches, just jacks and labels. Each channel is electrically isolated, so you can run a reverb on one and a distortion on the other without crosstalk. That suits stereo effects setups, or routing different voices to different processors. The lack of level controls is a trade-off for space and reliability. If you need to tweak send levels, patch in a VCA or attenuator upstream. The simple design means fewer points of failure.

Historical Context

The ADDAC200PI arrived in 2015, when Eurorack was shifting from boutique curiosity to mainstream presence. Modular users were no longer just oscillator-and-filter tinkerers. They were gigging musicians, producers and sound designers integrating synths into broader rigs, and that meant pedals. Guitar effects, long dismissed as "non-modular," were being rediscovered for their character, unpredictability and tactile immediacy. But the impedance and level mismatch between modular and pedal gear created headaches. Early solutions were janky: mixers used as attenuators, multiple modules chained together, or pedal inputs risking damage from overload. Manufacturers took notice. Doepfer released the A-138d, ALM released the SBG, and ADDAC System answered with the 200PI. The SBG added level controls and CV modulation. The 200PI focused on clean, no-frills translation. It wasn't the most flexible, but it was the most accessible. At $134, it undercut many competitors, and it came from a brand known for solid build quality and hybrid design.

Collectibility & Value

The ADDAC200PI isn’t a “collector’s item” in the traditional sense—no limited editions, no famous users, no mythical status. But it’s become a staple, the kind of module that shows up in racks quietly doing its job. On the used market, prices hover between $90 and $120, depending on condition and whether it includes original packaging. Units with scratched or dented panels still function perfectly, as the circuit is simple and the PCB is well-protected. There are no known widespread failure points—the TL072 is durable, and the passive nature of much of the circuit means few components are under stress. That said, technicians note that the PCB-mounted jacks, while serviceable, can suffer from solder joint cracks if subjected to repeated cable insertion/removal under tension. A simple reflow fixes this, but buyers should inspect the jacks for wobble before purchasing. Power draw is minimal (10mA on each rail), so it won’t burden even the smallest cases. Because it doesn’t rely on rare or obsolete parts, repairs are straightforward. The real value of the 200PI isn’t in rarity—it’s in utility. A used one in good condition is nearly as good as new, and there’s no “vintage premium” to pay. If you need it, buy it. If you don’t, you’ll probably wish you did.