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  Toggle Guide Line Display

Turn the Score Editor guide lines on and off. I have observed the change of settings in the View menu of the Score Editor. Changes between ‘All Objects’ and ‘Selected Objects’.

Display guide lines in the Logic Pro Score Editor — Apple Support

Note: You can also use the Toggle Guide Lines Display key command, which toggles between All Objects and the last selected display mode.

I do not see any “lines” when the setting is on. What I see is the little box that contains information like position, velocity, and sundry.

Display guide lines in the Logic Pro Score Editor — Apple Support

You can show an object’s exact time position by displaying guide lines in the Score Editor. Guide lines show exactly the relation of symbols, staves, and time positions).

  Octave - 2    ⇧Z

Shift down 2 octaves on the Step Input Keyboard.

Use step input recording in Logic Pro — Apple Support

Step input allows you to insert MIDI notes when you’re not recording in real time. You can use step input to create note runs that may be too fast for you to play or to replicate sheet music that’s too difficult for you to play.

  Create Marker without rounding ⌃⌥'

Creates a new marker at the current position in the timeline. The marker is not adjusted to a bar or quarter-note boundary.

Add markers in Logic Pro — Apple Support

You can add a marker at any position in your project. When you create a marker, it can be rounded to the nearest quarter note, to the nearest bar, or not rounded.