Last week I bought the Jean Michel Jarre soundpack for the Arturia Collection. There a some nice ARP2600 patches in there. One of them the bass sequence of Equinox 7. Pretty cool to see how it is made. I wanted to replicate that patch on the REV2 and I did it. It is not possible to do this on any synth. Is uses a square wave to modulate the VCOs om step 3 and 6 of the step sequencer. But inverted. I can share the patch.
A lot of his sounds are pretty nifty and ahead of his time I would say.