When the LCD is set to Custom, the top line of the MIDI Activity display shows the last MIDI message received, and the bottom line shows the last MIDI message transmitted. You can use the MIDI Activity display for checking MIDI connections. When Logic Pro receives more than one MIDI note simultaneously, the simultaneous notes are interpreted and displayed as chords.
Sometimes MIDI modules can continue to sound even when no note data is being sent to them. This indicates that they have not responded to the All Notes Off messages sent by Logic Pro.
In Logic Pro, do one of the following:
Click the lower section of the MIDI Activity display.
Click the Stop button twice in rapid succession.
In Logic Pro, double-click the MIDI Activity display (or use the Send discrete Note Offs (Panic) key command).
This sends separate Note Off messages for every note, on all channels of every MIDI port.
In Logic Pro, use the Send Reset Controllers key command.
This transmits control change message #121, with a value of 0 (reset all controllers), on all MIDI channels and outputs used by defined instruments. This neutralizes all MIDI controllers, such as modulation or pitch bends.
In Logic Pro, choose Options > Send to MIDI > Maximum Volume (or use the Send Maximum Volume key command).
This transmits a control change message #7 (main volume), with a value of 127, on all MIDI channels and outputs used by defined instruments.