The normaled (hard wired) connections for the Arp V are marked on the panel as a small box beneath an attenuator or patch point. You can patch any other output to an input, this will break the normaled connection. Check the 2nd-4th attenuators in the VCF section they are the normaled outs from the OSC's to the filter. If you want a different waveform run a patch cord from the OSC waveform out ( the patch points are located in each OSC section and marked accordingly) to an input attenuator in the VCF mixer.
Yeah, it's a little different set-up compared to the MMV( I've owned many ARP's Oysseys and 2600 and a Mg IIc), but certainly very flexiable and back in the day the normaled patch points made for fast sound changes and less cable clutter. Not that this affects us now, just remembering......
Which you choose should be the one that sounds most like what you are after and most comfortable with setting up.