Event Channel =   9

Set the Event Channel number for the selected events to 9. This saves you from having to use the cursor to drag a value up or down. You can also change the Event Channel for the selected events by double-clicking the channel field (open for editing) and typing in the channel number 1..16 and pressing return.

Change event values in Logic Pro — Apple Support

You can change the event values shown in the Event List Value, Number, and Channel columns by using the mouse as a slider or with text input. You can not directly alter the event type in the Status column.

  Trim Note to Remove Overlaps for Selected

The menu commands say ‘with’, the key command says ‘for’. Odd.

Multiple notes must be selected. The notes that occur earlier in the time line get shortened. Quick way to clean up sloppy “playing”.

Resize notes in the Piano Roll Editor in Logic Pro — Apple Support

Note to Remove Overlaps with Selected

  Select And Operate using Transform User Preset 18

Select events and change them according to the rules of User Preset 18.

Use MIDI transform sets in Logic Pro — Apple Support

Depending on your needs, it may be worthwhile to create your own transform sets. These can be configured and saved as part of a project. (Doing this in your template projects makes your transform sets available in all projects.) Your transform sets are shown at the bottom of the Presets pop-up menu.

  Select And Operate using Transform User Preset 20

Process the MIDI events using program 20. Lots of program slots. Unlikely to ever need 30 user-defined programs. The built-in programs do a lot of the typical heavy lifting.

Logic Pro MIDI Transform window overview — Apple Support

The MIDI Transform window is a powerful tool for edits that would otherwise be impossible (or tedious). For example, imagine an orchestral project that has been sent to you for editing. The individual violin and viola parts were recorded with a different string library. Two hundred MIDI regions contain aftertouch information that introduces an unpleasant pitch modulation, and some sample layer switching artifacts when played with your string samples. After looking at this aftertouch information, you discover that only a small range of values is causing the problem. Your options: edit your sampler instruments, manually remove all aftertouch information (region by region, or globally, thus losing the performance benefits that the aftertouch information provides), or alter the problematic values in the MIDI Transform window.