ADDAC System ADDAC805 (2014–Present)
A 4HP Eurorack panner with one main knob and a CV input.
Overview
You know that moment when you’re knee-deep in a patch and realize you need to smoothly shift a sound from left to right, but your mixer’s just sitting there like a brick? That’s where the ADDAC805 shows up—not with fireworks, but with a quiet “I’ve got this.” It’s not flashy, not polyphonic, not even stereo by default, but it does one thing with surgical precision: voltage-controlled panning and crossfading. At just 4HP wide, it’s a space-saving hero in a format where every millimeter counts, and it nails the fundamentals without pretending to be something it’s not. This isn’t a Swiss Army knife; it’s a scalpel.
The original ADDAC805 launched in 2014 as a straightforward analog panner. It's designed to crossfade between two signals or pan a single stereo source, which suits live performance tweaks, subtle spatial movement, or morphing between waveforms. The front panel is minimal: a single knob labeled "Initial," a CV input with attenuverter, and a switch to invert the CV response so you can flip the panning direction on the fly.
It shares DNA with the more advanced ADDAC805.VS2, which added dual crossfaders and 4-quadrant mixing. The original 805 keeps things simple. It runs on a standard Eurorack power bus, draws a modest 60mA, and uses high-quality analog VCAs for a clean, transparent signal path. It handles both audio and CV, so you can use it to blend LFOs, morph between envelope shapes, or create evolving filter sweeps by crossfading between control voltages.
Specifications
| Manufacturer | ADDAC System |
| Production Years | 2014–Present |
| Original Price | 80.00 € |
| Format | Eurorack |
| Width | 4 HP |
| Depth | 4.5 cm |
| Max Current Draw (+12V) | 60 mA |
| Max Current Draw (-12V) | 60 mA |
| Bus Board Connector | 8×2 IDC (Doepfer style) |
| Inputs | 2× Mono Signal Inputs, 1× CV Input with Attenuverter |
| Outputs | Left Output, Right Output |
| CV Inverting Switch | Yes |
| Signal Path | Fully analog, DC-coupled |
| VCAs | Analog voltage-controlled amplifiers |
| Front Panel Options | Custom colors available (Black, Green, Blue, White, Silver Gray, Yellow, Gold) |
| Included Accessories | Black screws, black fibre washers |
Key Features
The “Initial” Knob and CV Control
The "Initial" knob is a manual control that sets the base panning position. Turn it left and the signal leans to the left output. Turn it right and it shifts to the right. Patch in a CV and the dedicated input, with its reversible attenuverter, lets you scale and invert the incoming voltage to tune how the panning responds. To make a rising CV move the sound from right to left, flip the switch. To tame a hot envelope so it doesn't slam the pan all the way, dial back the attenuverter.
DC-Coupled Analog VCAs
The ADDAC805 uses fully analog voltage-controlled amplifiers that are DC-coupled. That means they handle both audio signals and control voltages with no blocking capacitors in the way. You can use the module to crossfade between two LFOs for an evolving modulation source, or blend envelope generators to produce hybrid shapes. Because the VCAs are analog, the transitions are smooth, without the stepped or quantized artifacts you might get from digital solutions. The signal path is clean and transparent, with no coloration or noise added.
Compact Design and Build Quality
At only 4HP wide, the ADDAC805 suits skiff builders and anyone short on panel space. The front panel is sturdy, the jacks are securely mounted, and the knob has a smooth, precise feel. The module ships with black screws and fiber washers, and ADDAC also offers custom-colored front panels. It's not the most feature-packed module in the ADDAC lineup.
Historical Context
The ADDAC805 arrived in 2014, when Eurorack was shifting from niche curiosity to mainstream synth culture. Manufacturers were racing to fill gaps, and utility modules, especially VCAs and mixers, were in high demand. ADDAC, already known for designs like the ADDAC101 .WAV Player and ADDAC701 VCO, positioned the 805 as a no-nonsense solution for panning and crossfading. It wasn't the first module to do this, but it stood out for its compact size and clean implementation. Competitors like Intellijel and Mutable Instruments offered similar functionality, but often in wider formats or with more complex routing. The 805 found its niche by being simple, reliable, and affordable.
It also reflected a trend toward specialized, single-function modules. "Do everything" modules were becoming bloated with features, and the ADDAC805 didn't try to be a mixer, a VCA, and a sequencer all at once. It panned. It crossfaded. That approach appealed to purists and minimalists, and the module became a staple in many systems, especially those focused on live performance, where predictability and ease of use matter more than a long feature list.
Collectibility & Value
The ADDAC805 isn't rare, and it's still in production, so it doesn't command vintage premiums or sell for double its original price. New units list for around €80 (excluding VAT), and used ones typically go for €50-€70 depending on condition and whether they've been customized with a special front panel. It's a passive utility module with no moving parts beyond the knob, so failure rates are low. There are no trimpots to adjust, no firmware to update, and no complex circuitry that tends to degrade over time. Like any analog module, it can develop issues after power surges or physical damage, so check for scratchy pots or intermittent outputs before buying.
Some users have reported slight channel imbalance in early units, where one side of the panner is slightly louder than the other. It isn't widespread, but it's worth testing on a used one. The module is DC-coupled and handles up to 10V signals without issue. Avoid overloading it with extremely hot outputs, as that could stress the VCAs over time. Maintenance is minimal - keep the jacks clean and the module properly powered.
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