Hi folks! Running GB 10.3.4 on Catalina 15.5, I want playback/audio output to go through USB MIDI to the connected MIDI keyboard. Input is no problem. But no matter what I do, output is played back through the MacBook's speakers and not the connected MIDI keyboard. I've spent hours looking for help online and playing with the Audio MIDI setup app and just can't figure it out. 25 years ago, on a PC running Win95 and CakewalkPro with an internal PCI MIDI card, this was no problem. Simply open CakewalkPro, select the MIDI card for output, and viola!