ADDAC System ADDAC702 Dual (2014)
The ADDAC702 Dual was ADDAC System's first voltage-controlled filter, introduced around 2014. Documentation is thin. No detailed specs like frequency response or current draw seem to have survived, but what is recorded shows what the module was meant to do.
The module packs two independent filters into 16 HP: a high-pass and a low-pass. Each has its own audio input and output, its own controls and its own CV inputs. Cutoff and resonance are both voltage-controlled, with dedicated attenuator pots for the CV. The design is openly inspired by the MS-20 filter. A switch toggles between normal cutoff behavior and an adjustable "Smooth" circuit, which is meant to simulate vactrol-style response on the cutoff control.
Known specs:
- 16 HP Eurorack module
- Two independent filters (high-pass and low-pass), each with dedicated audio I/O and CV controls
- Voltage-controlled cutoff and resonance with dedicated CV attenuators
- Switch for normal cutoff vs. adjustable Smooth (vactrol-simulating) mode
- Listed at £269.00 at Juno Records; Perfect Circuit listed it at $149.00 at one point
The record is otherwise sparse. There are no user reviews, no power draw figures, and no production run details beyond a 2014 listing date. It appears to have been a straightforward entry in ADDAC's lineup, their first stab at a filter, built around a proven topology. Juno Records (n.d.) carried the module and described it as ADDAC's "first Voltage-Controlled Variable Filter," noting the MS-20 inspiration and the vactrol-simulating Smooth circuit.
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