You can use the View Filter to specify which event types are displayed in the MIDI Event List. This can help you zero in on only the events you want to affect; it also protects MIDI events from being edited or deleted. Events not displayed in the MIDI Event List still play back.
The View Filter can be set to display “all” messages, “only” the specified messages, or “all except” the specified messages.
When using the All Except option, the selected events are not displayed. Conversely, when using the
Only option, only the selected events are displayed.