Monitoring and Resetting MIDI Events
The top line of the Transport bar’s MIDI Activity display shows the last MIDI message received. The bottom line shows the most recently transmitted MIDI message. The display is mainly used for checking MIDI connections.
When Logic Pro receives more than one MIDI note simultaneously; the respective, held intervals (between notes) are interpreted and displayed as chords.
On occasion, MIDI modules continue to sound, even when no note data is being sent to them. This indicates that your sound sources have not responded to the All Notes Off messages sent by Logic Pro.
Click the lower MIDI Activity display section in the Transport bar.
Click the Stop button twice in rapid succession.
In both cases, reset messages are sent, as defined in Logic Pro > Preferences > MIDI > Reset Messages.
Double-click the MIDI Activity display in the Transport bar (or use the Send discrete Note Offs (Panic) key command).
Separate Note Off messages are sent for every note, on all channels of every MIDI port, which should do the trick.
Choose Options > Send to MIDI > Reset Controllers (or 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.
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.
Choose Options > Send to MIDI > Used Instrument MIDI Settings (or use the Send Used Instruments MIDI Settings key command).
This resets your sound sources, if unexpected program changes occur mid-performance.
Turn on the Send After Loading Project: Used Instrument MIDI Settings option, in the File > Project Settings > MIDI > General pane.