ADDAC System ADDAC815 (—)
A quiet modular FX router that makes signal flow part of the instrument
Overview
The ADDAC815 Mixology has no flashing lights and no wall of knobs. It isn't a synth voice, a filter or an effect. It doesn't generate anything at all. But in a Eurorack system it changes how you handle effects. You can let reverb smear across one loop while delay chases another, without patching and repatching.
ADDAC System built the ADDAC815 as a Eurorack adaptation of their standalone Mixology pedal. It brings a live-sound engineer's routing logic into the modular world. At its core it's a dual FX router and feedbacker, designed to manage two independent effect chains. You feed it two input signals - say, a synth voice and a drum sequence - and route each through two separate effects sends and returns. The switching is the clever part. You can choose whether each input goes to the effects pre- or post-recording, or bypasses them entirely, while still processing the final output with those same effects. In a live modular set, patch changes need to be fast, reliable and expressive, and this helps.
Owners also found a second use for the ADDAC815: a 3x3 matrix mixer. By repurposing the sends and returns, it can blend three inputs across three outputs, for audio or CV mixing. It isn't labeled that way, but the function is there.
Specifications
| Manufacturer | ADDAC System |
| Model | ADDAC815 Mixology |
| Product Type | Eurorack module |
| Width | 10HP |
| Original Price | €160 |
| Function | Dual FX router and feedbacker |
| Additional Function | Can also function as a 3x3 matrix mixer |
| Series | ADDAC800 Series |
Key Features
FX Routing with Performance in Mind
The ADDAC815 works best with effects in real time. It takes two inputs and routes them independently through two effects loops. Switches decide whether the effects are applied before or after recording, so you can capture a dry loop and still add reverb or delay in playback. That's especially useful for live looping, where layering dry and wet signals without re-patching can make or break a performance. You can record a loop dry, then add modulation or reverb on top during playback, or the other way around. The module handles the routing cleanly, without signal degradation or crosstalk.
From Pedal to Rack: A Smart Eurorack Translation
This isn't a ground-up design. It's a direct Eurorack adaptation of ADDAC's Mixology pedal, refined for modular integration. That origin shows in the layout and logic: it thinks like a pedalboard manager, not a traditional modular module. The controls are straightforward, almost utilitarian, with switches and jacks placed for immediate access. It doesn't try to do everything. It fits in 10HP, leaving room for the effects it's controlling.
Hidden Depth: The Accidental Matrix Mixer
The ADDAC815 is marketed as an FX router, but its architecture lets it double as a 3x3 matrix mixer. Use the sends and returns as bidirectional jacks and you can route three inputs to three outputs with individual level controls. It isn't labeled or documented as such, but multiple sources confirm it, and it has become a favorite workaround for modularists short on mixing options. It won't replace a dedicated matrix mixer with full CV control. For basic crossfading, signal distribution or light modulation routing, it works.
Historical Context
The ADDAC815 Mixology was released as a follow-up to the standalone Mixology pedal, which debuted in December of an unconfirmed year. It was brought into the ADDAC800 Series—a lineup categorized under "Analog Sound Utilities"—positioning it alongside practical, function-driven modules rather than sound-generating ones. While the exact timeline isn’t documented, its release reflects a broader trend in the modular community: the translation of proven pedal concepts into compact, rack-mountable formats. ADDAC didn’t reinvent the wheel; they took a working idea and made it fit the rack, giving Eurorack users a tool that solved a very specific, often overlooked problem in signal management.
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