[Frank]’s Kerberos has MIDI In, Out, and Thru, controlled by the 6850 ACIA chip, just like the old 80s interfaces. This allows the Kerberos to interface with the old Sequential Circuits ...

Finally, we get a look at a proper schematic at the four minute mark which details the pull-up resistors, hardware reset circuit, and the optoisolator he added for the MIDI connections themselves.