Ok, one more bit I forgot. REAL IMPORTANT. Maybe you saw this already in your research. When you set up the track for the BB, you have to set it up an External Instrument track.
Here, my output is set to my Interface, a Pro 14, at MIDI 1. The BB is connected to the Pro14. The BB and the track are set to the same channel. So in your setup with an external keyboard, you want to be transmitting on the Midi Channel selected in the BB, and you want to have the track you are playing/recording to also set to that Midi Channel.
The BB is going to need a midi connection to your computer to be receiving the midi notes.
Your set up is essentially thus:
Midi keyboard > Computer > Interface midi> BB, all with midi connections.
Then, since the BB is producing sound you want to record, that is connected as:
It took me a little while today, but I found it and I have it working. Then, of course, you also want to have the BB drumkit selected as the one you want.
There is a real good tutorial on 9to5mac.com. Search for “The Logic Pros: How to use MIDI hardware synthesizer in Logic w/ External Instrument plug-in.” The External Instrument plug-in is part of Logic. What it does is automatically create you external instrument midi track and the audio recording track when you have it selected at the time your create a new track. It’s all in the tutorial.
Just remember, you’ll be recording a mid track (i.e. external instrument), and an audio track (the output from the BB), at the same time. So, you are going to need both tracks set up and enabled for recording. And, yes, it does work.