General MIDI preferences
General MIDI preferences are only available when Show Advanced Tools is selected in Advanced preferences.
“External stop message ends recording” checkbox: If using external synchronization and the timecode stops while recording, record mode is turned off. If this checkbox is unselected, Logic Pro stops, but remains in record mode (record mode is paused).
Reset All MIDI Drivers button: Resets all MIDI drivers. This can help if you experience MIDI communication problems.