It connects by default only MIDI software with hardware MIDI ports. In case you want hardware to be connected to hardware, you’ll have to set up the rule in /etc/amidiauto.conf.
See this thread: Midi connection manager - #16 by magino, it should contain everything you need to know.
Keep in mind that when activating ORAC, the config from /usr/local/patchbox-modules/orac/amidiauto.conf gets copied to /etc/amidiauto.conf.