The Oberheim OB-X was the first of Oberheim's OB-series polyphonic analog subtractive synthesizers.
First commercially available in June 1979, the OB-X was introduced to compete with the Sequential Circuits Prophet-5, which had been successfully introduced the year before.
The OB-X was used in popular music by Rush (on Moving Pictures and Signals), Nena, Styx member Dennis DeYoung (used frequently from late 1979 to 1984), Queen (on The Game, their first synthesizer on an album), Madonna for her debut album, Prince, and Jean-Michel Jarre who used it for its "brass" sounds.
The "X" in OB-X originally stood for the number of voice-cards (notes of polyphony) installed. It came in four, six, and eight-voice models with polyphonic portamento, and sample and hold. Even the 4-voice model was expensive at US$4,595. The entire range used "paddle" levers for pitch and modulation, Oberheim's answer to the "wheel" controls of the Prophet-5. Though these controls were never as popular as the standard pitch and modulation wheels, the philosophy was to mimic the motion of a guitar player bending the strings on their guitar. On most other synthesizers the pitch bend wheel was on the left, and the modulation wheel to the right of it; on the OB-X Oberheim placed them in the opposite relative positions. In addition to this unique configuration the polarity of the paddles was distinctive; the player would pull back on the pitch lever to bend the pitch sharp, and push forward to bend flat.
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