Well I am a PC guy, but maybe I can get you going... or at lease get discussion moving?

Do you see your keyboard in the Midi Setup. This is my SL88i-Studio Logic. BIAB (PC) recognizes all possible midi-in's from this single board. Two are coming from the USB connection and the third (my preferred selection) comes via my the Midi out of the board to the Audio Express Device.

Be sure all this is up and running before you open BIAB.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).