Tokøta from Mastering.com walks through turning basic step-sequenced notes into sustained chords in Logic Pro's step sequencer, using the tie and octave functions.
Tying notes together removes gaps between steps, letting a chord ring out for a full bar instead of cutting off at every eighth or sixteenth note.
Stacking octaves fills out a thin chord voicing, which matters most on melodic and harmonic parts where a single octave can sound hollow.
Switching from a scale-locked template to chromatic mode frees you to build chords outside the current key, then toggling between minor and major templates lets you quickly compare how the same shape feels in each mode.