I'd like to remind Arturia of something important if they ever tackle the Oberheim OB-X series.
The OB-X's voice structure used discrete circuitry (except for the envelopes, which used Curtis chips). Plus, each voice card had minute variations in calibration; therefore, no two voice cards sounded exactly alike. Make sure to develop each voice individually, as Sonic Projects did for their OP-X Pro; do not clone them.
As for the OB-Xa and OB-8, their voice cards used Curtis chips all the way, but both have very different sonic characteristics as well. In any event, make sure that the sonic characteristics of each is unique to the original hardware.
Thanks!