just to complement
Is good to know what these three symbols mean.
Eye: See the MIDI
Locker: Editable
Arrow; Insert MIDI ( You can only choose one to insert )
the same applies for the track list
What was happening is with "Avoid automatically setting MIDI items from other tracks editable" select the other items would make it visible but no editable ( you would have to manually click on the locker to make them editable ) now with this your selection is unlocking to edition and making them visible.