Logic Pro X keyboard command of the day. #LogicProX @StudioIntern1

  Trim Region Start to Next Transient    ⌃⇧]

Straight-forward. Remove the front of the region up to the next transient. Handy for editing.

Trim audio regions in the Audio Track Editor — Logic Pro X:

You can trim an audio region in the Audio Track Editor to remove part of the beginning or end of the region.

⇧ SHIFT – ⌃ CONTROL – ⌥ OPTION – ⌘ COMMAND