This is my latest iteration of a Jupiter 8 style synth based on two Boutique JP-08 synths. It's not polychaining, I use my own software to manage the incoming notes from the midi keyboard and assign them to the upper or lower synths which are effectively used as sound boards inside the chassis. I also built a custom mixer board to take care of volume and balance between the upper and lower sections and added a Jupiter 8 style arpeggiator.