In the CoreAudio MIDI setup, go to the Window menu | Show MIDI Studio (if necessary).

You typically need to Add External Device, then connect the OUT of the device (your keyboard) to the IN on the USB interface pictured there, by clicking and dragging a cable.

Next, you should restart Band-in-a-Box if it's already open. Go to the Options | CoreMIDI choose ports, and select your MIDI interface under Input.


Andrew
PG Music Inc.