The OhmRGB can only interface over USBMIDI with one of the norns.

But… You could use the DIN MIDI out from the OhmRGB thru a USBMIDI adapter ($10-15) to the second norns.

At that point you’d just need to figure out your mapping so that MIDI events for one device are only mapped to the norns you want (keep in mind in this case all the MIDI would be sending to both)

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