If the Jupiter 8 has a DCB socket then you could consider a Kenton PRO-DCB box.
http://www.kentonuk.com/products/items/dcb/prodcb.shtml
I have my Juno 60 hooked up to one of these and it works a treat, both for sending MIDI notes and syncing the arp to MIDI clock.
An Octatrack or Monomachine would then be better for sequencing it. The Jupiter 8 isn’t really a synth designed for CV control.