Repeat Regions/Events Multiple Times… — Logic Pro keyboard command of the day (KCotD)

  Repeat Regions/Events Multiple Times…

Make multiple copies (or aliases) of the selected region. Simple way to repeat sections of audio, or MIDI events

Repeat regions in the Logic Pro Tracks area — Apple Support

You can repeat one or more selected regions in the Tracks area. Repeating a region pastes one or more copies (or aliases) of the regions following (to the right of) the regions in the same track.

Double Cycle/Loop Length ⌥⇧⌘. — Logic Pro keyboard command of the day (KCotD)

  Double Cycle/Loop Length   ⌥⇧⌘.

Doubles the cycle length. The cycle area is lengthened in a forward motion. This becomes important if you change your mind and want to ‘Halve Cycle/Loop Length ⌥⇧⌘, — Halving shifts the start of the cycle forward in time. The only way to make the cycle smaller leaving the start position alone is by moving the cycle end mark backwards

Use the cycle area in Logic Pro — Apple Support

You can use the cycle area to repeatedly play a particular part of a project. The cycle area can be used for composing, practicing a part before recording, recording multiple takes, and other purposes.

Change loop settings for cells in Live Loops for Logic Pro — Apple Support

Loop Length: Determines the length of the loop. Changing the Loop Length value can be useful when you want to loop only a particular portion of a cell.

Toggle Cycle Preview ⌃C — Logic Pro keyboard command of the day (KCotD)

Shows the controls at the bottom of the Project Audio Browser window
  Toggle Cycle Preview    ⌃C

One of the many commands that have no particular documentation.

In the Project Audio Browser window there are playback controls. Play, Cycle, and Volume. The Cycle button is the named ‘Cycle Preview’ button.

When the Cycle is enabled the selected audio region will loop on playback.

Logic Pro Project Audio Browser interface — Apple Support

Cycle button: Loops playback of the selected audio file or region. Use in combination with the Play button.

Transpose -1 Octave ⌥⇧↓ — Logic Pro keyboard command of the day (KCotD)

  Transpose -1 Octave    ⌥⇧↓

Transpose the rows in the sequencer down an octave.

Logic Pro Step Sequencer overview — Apple Support

Step Sequencer is inspired by classic hardware step sequencers that have rows of configurable switches or knobs used to generate repeating musical patterns. In Step Sequencer, you create patterns by editing multifunctional steps in the step grid. Each row controls either a sound (which can be a drum kit piece, a note on an instrument, or a range of notes) or an automation parameter (letting you create automation changes over time in the pattern). Each step represents a definable length of musical time–by default, steps are of equal length, but you can change the length for individual rows or steps. You can adjust a wide range of parameters for individual steps, including velocity, pitch, gate time, and more; and edit pattern and row settings including pattern length, row loop start and end points, playback position, and rotation.

Open/Close Instrument Plug-in Window of focused Track — Logic Pro keyboard command of the day (KCotD)

  Open/Close Instrument Plug-in Window of focused Track

This command replaces the need to click on the Instrument slot of the channel strip to open the instrument. It also saves the need to click the close box to make the window vanish.

Assigning this command to a keypress is highly useful. I have combined it with corresponding ‘Open/Close Audio Insert n of focused track’ so I can quickly pop open the plug-ins.

Work in the plug-in window in Logic Pro — Apple Support

In Logic Pro, click the center area of the plug-in slot.