That’s not going to give you what you want, and you might end up with a pulse of a higher voltage than the volca expects, although if they were sensitive to 5v pulses i think we’d all be aware and cautious about that by now
The volca’s can get going off of a 1.5v-ish trig pulse
Anyway - midi adapter cables are not remotely applicable in your case - the Din Sync analogue out is not using the pins that midi does, so that adaptor won’t be right unless it’s din sync specific - even if it is your clock pulses will be far too fast for the volcas
You need a Din Sync adaptor to get the analogue pulse out or you need a device which translates this, e.g. a monotribe can do this from midi in to pulse out or maybe a keystep or similar
you can clock divide teh din-sync pulses, you may need to divide by 6 or 12 iirc
or maybe take a midi clock into an arduino or similar and chuck out pulses to taste
your other option is to drive the volcas with audio impulses, but that would forfeit a channel of the DT and would stop you using wet fx - a bit easier on cue out of OT
here’s info on Din-Sync - it is an entirely separate mode and technology on the DT which only shares teh same DIN port outlet shape, but not pins or protocol, one being analogue the other being digital, only a dedicated adaptor can help