via this auction
"Older ATC-1 upgraded by Studio Electronics a couple of years ago. Running version 2.3 firmware, upgraded with internal quad filter system with discrete Moog, SEM (lp and bp), 303, and Arp style filters. It has a switchable discrete Moog style VCA on the back end that makes it sound huge. It was given the full run through by SE and has a new face panel and replaced battery for memory. They also added a couple of CV jacks for filter cutoff, resonance, and VCA control."
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