How to very simple MIDI Thru setup in orac?

Use case is (for an organellem):

  • Keyboard plugged into organelle USB port
  • Organelle MIDI Dins plugged into computer via midi interface

I’ve tested these independently, but don’t see how to get the USB midi to send to the DIN MIDI out.
I also don’t understand how I would switch the keyboard metronome / organelle being the master clock (although when plugged in by usb or midi the organelle takes clock from the keyboard by default)

Technobear’s Advanced MIDI setup post post probably contains this information, but it’s much more complex than my needs so I’m having a bit of difficulty following it.