Create Track Stack…    ⇧⌘D

There are two kinds of track stacks — Summing (bus/aux) and Folder (VCA). Logic creates a track in the Arrangement area with the selected tracks included. All the tracks are routed to the same AUX channel, or controlled by the same VCA. It is a very convenient way to get AUX tracks and VCA tracks into the Arrangement area. Allows you to move the positions of the channels/VCA in the default mixer view.

I use track stacks (summing) all the time.

Nesting of track stacks is not possible. If you want a number of Summing stacks to be in a Folder stack you can’t do it. You can place all of the track stacks onto the same VCA, create a track for the VCA, and move the VCA track next to the summing stacks.

Create and edit Track Stacks in Logic Pro — Apple Support

You create a Track Stack by selecting (adjacent or nonadjacent) tracks in the Tracks area. Nonadjacent tracks move so that all tracks are grouped together in the Track Stack. Both types of Track Stacks can contain any combination of track types as subtracks. A folder stack can also include summing stacks as subtracks.

  Insert: Decrescendo    ⌃⇧.

Using this command is so much easier than finding the decrescendo in the part box and dragging it to the location. Simply click at the right spot, press the keys, presto.

I have observed that for a software instrument (Classical Piano) a meta event on MIDI channel 2 is inserted — Crescendo — for both crescendo and decrescendo. The length is indicated in bars and beats. I have no idea how (or if) the direction is indicated or used.

Add dynamic marks, slurs, and crescendi to a score in Logic Pro — Apple Support

You can add slurs to indicate notes that should be played legato, and add dynamic crescendo and decrescendo symbols (sometimes called hairpins). Automatic slurs can cover a selected group of notes, and adjust when the notes are copied, moved, or transposed. Using key commands, you can quickly add and edit automatic slurs for an entire phrase, part, or score.

  Beam Selected Notes    ⌃B

Forces a beam to the following note.

It would make sense for me to learn some of the finer points of score editing in Logic.

I originally learned to write scores by hand. Was fascinated by a “Music Typewriter”, but found it too hard. Jumped on “Finale”, version 1. Very complex. Expensive. I paid for my Finale license and made money with it by scoring parts — $10 per page by hand. Now there are far too many scoring tools to really think about, and I’m not really in the business anymore.

As an exercise I could re-create my modulations “homework sheet” in a Logic project.

Control beaming in the Logic Pro Score Editor — Apple Support

By default, a note’s stem direction and length depend on the settings in the Staff Style window. You can change these attributes to improve readability; for example, to group notes meant to be played as a voice in a polyphonic passage.