My USB midi device (module, keyboard, workstation) is detected by OSX “AudioMIDI Setup” when I install the drivers, but I don’t have input/output choices in my host application.
When AudioMIDI Setup scans and detects your USB midi keyboard or module as an “interface”. You can tell this, because the “in/out” arrows of the detected device are on the bottom, not the top.
The solution is to “add device” and configure it as you would a keyboard or module, setting the necessarry send/receive channels. Then connect this new device’s arrows to the detected device’s arrows.
Now you should have midi communicatio with your USB keyboard/module.
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