Can't you do that using the fine tune and/ or put a modulator to the oscilator?
Modulators like envelopes, the “Tracking” generator with Smooth option, LFO, Voltage Generator and it's Lag option, other OSCs outputs and the sequencer unquantified outputs can be used.
I would believe so.
Are you sure you remember correct about the originals in this matter?
BTW. I think that many things is possible in ARP 2600 V3, that's possible in the originals. But sometimes one might have to use the possiblities Arturia offer,