via this auction
video in the listing previously posted here.

The Chroma Polaris is an ARP-designed, 6 voice microprocessor-based sibling of the famous ARP Chroma with the raw and powerful analog sound of the magnificient Curtis CEM3372 4 pole, 24 dB/oct. low-pass filter chip, used in iconic synthesizers such as Oberheim's Matrix 12 and Xpander, and the Sequential Prophet 600 & Prophet T8.
It boasts 2 DCO (CEM3374) per voice, plus a suboscillator and noise circuit, osc sync and ring modulation, 2 envelope generators (filter and VCA), LFO, a basic velocity sensitive 61-key keyboard that can be layered or splitted, 132-memory programs, full MIDI implementation (all sliders can be automated via MIDI, up to 3 layered programs in different channels, storage/retrieval of patches via simple Sysex) and a basic sequence recorder.
Model 2123B was a rarer still series with 100% the same exact specs but produced for the Japanese market.
This unit has been thoroughly serviced and future-proofed for use, specially all the usual issues that this synth suffers at some point:
New high-quality panel membrane replacement by Paul DeRocco
Velocity-sensitive keyboard serviced and calibrated
Firmware EPROM updated to V9 (latest)
Power supply set for 220V-240V (reversible to 110V-115V)
Unit tested and calibrated"
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