Have a look at this video. In it I am sending clock (16th note trigger pulses) from the TR-606 to the clock in of the Roland SH-101. This keeps the SH-101 internal sequencer/arp in time with the TR-606. I am controlling the pitch of the 101 via the CV input (which is directly mapped to pitch) using an external sequencer. I can then transpose the sequence using the keyboard and fiddling with the slider to change the filter etc. The Analog four is more than capable of performing all the necessary CV/trigger/clock duties shown here.

However I don’t see a dedicated pitch CV input (mapped directly to pitch) on the back panel of the Jupiter. Although I’m pretty sure it has it’s own internal sequencer. Definitely has an arp. Maybe someone could chime in and enlighten us on that. If it does have an internal sequencer then your A4 cv’s are free for use on other modulations

Golly though, If you have the cash for a good condition Jupiter 8, go for it. I would love one. You’ll defo get great stuff out of it if you ignore the fact it has no midi and use it with other analog gear. It’ll be a blast