via this auction

It has been fully serviced and upgraded by Randel Osborne who has restored many Chromas and also builds the Enabler controller [see this video].
- installation of the switching power supply (by Luca Sasdelli)
- installation of the CPU Plus (CC+) control board (MIDI upgrade with breakout cable)
- replacement of electrolytic capacitors and addition of bypass capacitors in sample/hold section of all voice cards
- refinishing of all woodwork
- complete synth testing, adjustment, cleaning
Extreme rarity, top-level restoration and essential upgrades make this Expander a very special instrument and high-value investment. It's the rarest version of ARP's most powerful synth, in perfect working condition. Amazing by itself or interfaced with another Chroma."
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