via this listing
"You're looking at the majestic Oberheim OB-Mx, with four voice cards, meaning eight voices of polyphony. OS 2.00. Works without problems. I will add another full OB-Mx without voice cards in the sale, which you can use for spare parts or to split the four voice cards into, so you have two full synthesizers. Yes, you read that right, there are TWO OB-Mx synthesizers included in the sale. The second unit runs OS 1.00. I will add several spare 2.00 ROMs as well.The Oberheim OB-Mx is a rare and powerful analog synthesizer module released in the mid-1990s under the Oberheim name, though designed and produced by Gibson after acquiring the brand. Engineered to compete with classic vintage synths, the OB-Mx offers a modular voice architecture inspired by the Oberheim OB-series and Moog’s legacy. It features up to 12 voices, with each voice card containing dual multi-mode filters capable of emulating both Oberheim and Moog filter designs, making it highly flexible for sound design.
Its rich and authentic analog tone, deep modulation capabilities, and rarity have made it a coveted piece among synth collectors and sound designers looking for a unique blend of classic Oberheim warmth and Moog-style punch.
The architecture of the Oberheim OB-Mx was designed by Don Buchla, the legendary synth pioneer best known for his work on modular synthesizers and alternative synthesis approaches. While the OB-Mx was produced under the Oberheim brand, Buchla’s involvement brought a distinct modular and experimental edge to its design. His influence is evident in the flexible voice architecture, extensive modulation capabilities, and the combination of Oberheim and Moog-style filters, making the OB-Mx a unique hybrid of classic analog warmth and modular flexibility.
It's hard to find an equal in terms of analog sound and modular flexibility, so in many ways it's in the very top echelon of synth design."
