Tokøta, from Mastering.com, breaks down Logic Pro's step sequencer inside the Drum Machine Designer, a faster alternative to programming beats note by note in the piano roll.
Instead of a MIDI region, you create a pattern region and build rhythms by clicking steps on and off. Subdivisions can be straight, triplet, or dotted, and step count should scale accordingly (12, 24, or 36 for triplets instead of 16).
Each step carries extra parameters: velocity, gate, tie, note, octave, loop, repeat, chance, offset, step rate, and skip. Of these, velocity and repeat get the most use in practice.
Velocity lets you vary each hit's dynamics so a pattern feels less robotic and more human. Repeat generates rapid retriggers on a single step, from a few extra hits up to 16, useful for snare rolls and hi-hat stutters.