So this is probably an easy fix; I just have very little experience using MIDI in/out/thru on keyboards...
I have a Roland Fantom X8, and for years I controlled Logic Pro X with it effortlessly via USB. Now I have an iMac running Sierra, and no longer can use the Fantom's USB as Roland doesn't have updated drivers for Sierra. So I figured I can utilize the MIDI ports on the Fantom. So I have a MIDI cable connected to the midi OUT on the Fantom, going to the midi IN on my PreSonus Firebox interface (it's a MIDI/SPDIF breakout cable that plugs into the back of the interface). However, when I open Logic and pull up an instrument track, I hear nothing when I press the keys of the Fantom. What am I missing here? Do I need a second MIDI cable running out of interface to the keyboard? Let me reiterate that I only want to use the Fantom as a controller, to trigger Logic's synths and plugins. Help please!