"The OB-X saw the light of earth in 1979 and was the first fully programmable polyphonic synth built by Tom Oberheim. It's the direct successor to the famous SEM based units. The secret of the OB-X is that it still has the old discrete 12db SEM-filters. All later units such as OB-Xa, OB8 and Matrix as well as many competing products made the use of the more sterile Curtis filterchips. This fact makes the OB-X one of the best sounding polyphonic synths of all time. Experts put the OB-X in the same league as the Memorymoog. We love this synth!! The secret of analog behaviour: OB-X Voiceboards Various methods have been used in the plugins world to copy analog behaviour. SonicProjects has made a new and different approach. By extensive exploring of the real device it became obvious that a big part of the organic feeling comes from the minor differences in sound between the voices. This has nothing to to with random behaviour but with device tolerances and slightly different trimpot settings. SonicProjects has implemented this behaviour into the virtual device. There are four global buttons which let you control the detunings of the oscillators, filters, envelopes and portamento times."
Title link takes you there. Via this VSE post where you will find a couple of samples by , chnarles, also mirrored here.
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