Source
Oberheim OB-X (Wikipedia)
Cited by
-
Oberheim OB-X
Synthesizer · United States
The Oberheim OB-X, released in 1979, was Oberheim's first fully integrated programmable polyphonic synthesizer, available in four-, six-, or eight-voice configurations. It replaced the earlier stacked-SEM approach with internal discrete voice boards and patch memory, with two VCOs per voice and a discrete low-pass filter, and a 61-note keyboard.