I recently incorporated Total Mix and Fireface USB into my MacBook Pro system, running LogicPro, and I can't seem to get MIDI from my Yamaha P-250 piano keyboard controller into Logic. 
I must be doing something wrong because even though I have a USB running from the P-250 through a Thunderbolt 3 dock then straight into the computer, Midi isn't being transmitted and is not showing up in Logic.
It's driving me crazy because I'm sure it's just some small thing.
Any help?