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.