Jon shows you how he uses the Korg Nautilus as a Midi controller and as a Midi Sound Module in his Midi setup.
Crumar ST4 4-port Switchable MIDI Thru Box
https://www.sweetwater.com/store/detail/ST4MIDI--crumar-st4-4-port-switchable-midi-thru-box
MIDI Solutions Thru Box
https://www.bhphotovideo.com/c/product/1772021-REG/midi_solutions_2_output_active_midi_thru.html
MIDI Solutions Merger Box
https://www.bhphotovideo.com/c/product/1772014-REG/midi_solutions_2_input_midi_merger.html/?ap=y&ap=y&smp=y&smp=y&store=420&lsft=BI%3A514&gad_source=1&gclid=Cj0KCQiAwOe8BhCCARIsAGKeD551KwLnbsTAWyLwUwwHkORmFerWJQFS2V8MmFReVlYYXNsVoQHh29oaAnxwEALw_wcB