Please take the time to ensure you have the correct driver for your OS. There is no guarantee that “latest driver” is the correct one for your computer. I even re installed Logic Pro X - same thing!Stop re-installing things. I have the latest firmware in Montage8, latest Steinberg USB drivers and everything is updated. (Allowing you to use the MONTAGE as a MIDI interface for an external device). Port 3 (just FYI) is the 5-pin MIDI IN/OUT jacks on the back panel. Port 2 should be set for REMOTE CONTROL SURFACE commands using Mackie Control. When you set up your DAW, use Port 1 for music, (not Port 2) If you are hearing musical tones when you press buttons or pressing keys on your QWERTY play notes on the synth it is a sure sign you are sending data on the wrong Port.

You can understand that remote commands use Keys to act as On/Off switches, while Knobs and Sliders can work to control continuous functions. PORT 2 should be used exclusively for Remote Control Surface commands… this is where all the Keys, front panel buttons, sliders, and knobs, etc are re-tasked with commands to work the DAW REMOTE function. PORT 1 is used strictly for music performing (note-one, controllers, tempo, etc) When this happens it is because you have a mistake in your Port 1 and Port 2 MIDI settings.

Logic pro 10.4 bugs