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.

  Decrement Loop End for Row ⌥⌘-

Shorten the length of the loop. This command will wait for me to dive in to step sequencing again.

Logic Pro Step Sequencer overview — Apple Support

Using edit modes, you can control different attributes of the note or event triggered by a step. Some edit modes apply to only one row type, while others are common to both types. For note rows, you can change the velocity, pitch, gate time, number of note repetitions in a step, and other attributes. For automation rows, you can change the value of the automated parameter. Edit modes common to both row types include skipping and tying steps, changing the loop start and end point, and changing the step rate

  Paste Steps    ⌥⇧V

Paste the steps (on the clipboard) onto the current row. The contextual menu for the row has the copy/paste commands in it, available when there is something to be pasted, dimmed if not.

I used Opcode Vision and Studio Vision back in the late 1980s. At some point I should re-visit step sequencing with the incredible array of instruments I now can carry in my tool bag.

Edit Step Sequencer steps in Logic Pro — Apple Support

You can copy a step, including all of its step settings. When you paste a copied step, the destination row should be of the same row type (note or automation) as the source row. All step settings are copied, with one exception: If the step rate was not edited for that individual step (that is, if it still uses the pattern or row step rate), the pasted step inherits the step rate of the step that it replaces.

  Save Pattern    ⇧⌘P

Save the pattern. The command is located in the tool (gear) menu in the Step Sequence. A whole new (old) place to explore.

My first MIDI software (after my CZ Editor) was Opcode Vision — a MIDI sequencer. This modern take on the step sequencer (every pattern is a step sequencer? recursion is us)

Logic Pro Step Sequencer overview — Apple Support

Step Sequencer patterns are contained in pattern regions (in the Tracks area) and pattern cells (in the Live Loops grid). Pattern regions and cells are used primarily on MIDI-based (software instrument, external instrument, and Drummer) tracks. Pattern regions (but not pattern cells) can also be used on audio tracks to automate effect and channel strip parameters. A project can contain any number of pattern regions or cells.

Each pattern region or cell functions as an independent step sequencer, with its own configuration and settings. You can copy and move pattern regions like other regions in the Tracks area, while pattern cells can be copied, moved, triggered, and queued like other Live Loops cells. You can modify pattern region and cell parameters in the Region inspector or Cell inspector, respectively.