I agree that A/B tests will help here. Over the weekend I’ll prepare some AB’s using the Oberheim modules in Diva and similarly with Repro 5. I think it’s also worth listening to AB’s involving Arturia SEM V/Matrix 12 and Sonic Projects OP-X PRO-II, as these aren’t so militant about emulating the complete signal path (resulting far more friendly processor overhead). I’ll include iSEM (iOS) within that last batch as its also very processor efficient but successfully emulates the impact of separate filter responses on a per voice basis.
The sonic signature that connects all of the above VA’a has nothing to do with zero delay filter modeling or suchlike (both the SEM V and OP-X were designed before ZDF became the ‘soup du jour’ of the VA emulation community). It’s simply that they follow that original Oberheim 4-Voice architecture and individual ‘rotating’ polyphonic voices spread across the stereo field, each with a slightly different filter response; results in a killer recipe for pads and drones that sound very different to the polyphonic voicing of the e.g. Roland synths of the early to mid eighties. The Juno’s and Jupiters had their own secret sauce (their killer chorus units) but this was still very different to the Oberheims and Prophets.
I can only imagine how great VCV will sound with Vult’s ace Vessek unit (hybrid FM/phase modulation oscillator) spread across the stereo field in a similar manner. I’d imagine it would sound pretty darn awesome!