ADDAC System ADDAC802 (Out of Production)

Five VCAs that mix, route, and cut signal cleanly when you tell them to.

Overview

The ADDAC802 VCA Quintet Mixing Console is a Eurorack mixer with a lot of routing built in. ADDAC System made it as an update to their earlier ADDAC802 Audio Mixer. It's an analog module with five independent VCAs in 12 HP. It's out of production now.

Each of the five VCAs has a Solo/Off/Mix switch that decides where the signal goes. In Off, the signal is cut from both outputs. No bleed. The module handles both audio and CV, so it can shape modulation as well as sound. There are two independent mixing paths, Solo and Mix.

It’s part of the ADDAC800 Series, categorized under "800's Analog Sound Utilities," a quietly powerful family of utility modules that favor precision over flash. There’s even a reversed-panel variant, the ADDAC802R, for those who like their labeling upside-down or their panel layout flipped. But the core idea remains: give modular users a compact, intelligent mixer that doesn’t force compromises.

Specifications

Manufacturer	ADDAC System
Number of channels	5
Per channel features	VCA with initial Knob, Monitor LED, Independent output, Linear or logarithmic control, Solo/Off/Mix switch
Outputs	1 Pre Master VCA output, 1 Post Master VCA output, 1 Solo output
Width	12 HP
Depth	55 mm
Power consumption	190mA @ +12V / 150mA @ -12V
Format	Eurorack
Power supply compatibility	Compatible with +-12v and +-15v power supplies
Bus Board Cable	8 x 2 IDC (Doepfer style) connector
Features	1 Master Output
Features	External input into the Mix channel for daisy chaining
Features	2 independent mixing paths, Solo and Mix
Features	Mix Output includes a 6th VCA with Pre and Post outputs
Input signal types	Can mix both audio and CV
Per channel controls	1 Attenuator Knob per channel
Outputs	Standard output, Inverted output

Key Features

Five VCAs with a sixth in disguise

There are really six VCAs here. The Mix output has a sixth one dedicated to the master level, with both Pre and Post Master VCA outputs. The Pre output lets you send the signal out before it hits the final volume knob, useful for feeding external processors or clocking other modules with a clean mix reference. The master VCA handles dynamics control for the whole mix chain.

Smart routing with real choices

Each channel's Solo/Off/Mix switch is functional routing. Select Solo, and that channel feeds the dedicated Solo output, which works for headphone monitoring via a headphone amp. Choose Mix, and it joins the main bus. Flip it to Off, and it's completely disconnected. No leakage, no residual signal. In a lot of modular mixers "off" means "very quiet." Here it means off. The Solo path is independent, so you can solo multiple channels at once to build a private submix for A/B comparisons or sneak previews.

The knob that fights your instincts

The offset/mix dual function knob is a design quirk that either delights or confuses people, usually both. The knob's 12 o'clock position is maximum attenuation, not unity gain. Turn it left or right, and the level goes up. It feels backwards at first. Once you adapt, center is silence and the edges are loud. Some users like it for precise nulling; others find it a hurdle. A Reverb seller put it plainly: "I personally really like" this design.

Log or linear? You pick per channel.

Each VCA lets you switch between linear and logarithmic control response. Log suits audio, since your ears perceive volume changes more smoothly that way. Linear suits CV, where you want a direct, proportional relationship. You set this per channel, so you can route an LFO through one channel with linear response and a drum bus through another with log, all on the same module.

Daisy chaining done right

The external input on the Mix channel lets you chain multiple ADDAC802s (or other mixers) together without losing the master VCA's control. Feed another module's output into this input, and it gets processed by the final VCA stage. That keeps dynamics management centralized in a larger mixing system.

Monitor LEDs that tell the truth

Each channel has a Monitor LED that lights up when signal is present. These are presence indicators, not level meters. If the LED is off, the signal isn't getting through. That helps when debugging routing issues or checking if a gate is firing.

Collectibility & Value

The ADDAC802 is out of production, and prices vary a lot. Listings show used units as low as $309, while others ask $483.24 on eBay or $529 CAD at Nightlife Electronics. New old stock, if you can find it, might hover around $415. The original MSRP is disputed - some sources say $365, others $499. It holds an average rating of Ø 4.85 from 13 votes on ModularGrid, and one ModWiggler user simply wrote: "It's the best."

At least one user reported cold solder joints on the toggle switches - "fun glitches and signal drops," as they put it. If you pick one up and notice intermittent behavior on the Solo/Off/Mix switches, it's probably a reflow job. No other common failures are documented, but with the module out of production, official repair support is limited. Owners will need to rely on the community or skilled techs.

If you're hunting, look for units with clean switch action and solid LED response. Test every channel's routing - Solo, Mix, Off - and verify both Pre and Post Master outputs. The ADDAC802R, the reversed-panel version, is functionally identical, so it's just as valid a choice if the layout suits your case better.