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.
Note: If any of these parameters are being determined by the Articulation Set Editor for a given channel strip, the preference is dimmed.
MIDI Remote pop-up menu: Determines whether articulation switching is on or off.
MIDI Remote Set pop-up menu: Determines whether the MIDI Remote state is set per channel strip or globally. If you want the MIDI Remote setting to be the same for every channel, choose Global. Otherwise, keep this set to Per Channel Strip.
MIDI Channel pop-up menu: Sets the MIDI channel for articulation switches.
MIDI Channel Set pop-up menu:Determines whether the MIDI Channel is set per channel strip or globally. If you want the MIDI Channel setting to be the same for every channel, choose Global. Otherwise, keep this set to Per Channel Strip.
Octave Offset pop-up menu: Sets the octave offset for articulation switches. You can choose any octave between +10 and -10 octaves.
Octave Offset Set pop-up menu: Determines whether the Octave Offset is set per channel strip or globally. If you want the Octave Offset setting to be applied to every channel, choose Global. Otherwise, keep this set to Per Channel Strip.