SEIDS walks through the Piano Roll in Logic Pro, starting with the pencil tool for drawing MIDI notes directly, useful when you're building parts without a keyboard or controller.
Quantize snaps notes to a grid you choose, from whole notes down to 16ths. Dialing back the strength to around 60% keeps some natural timing instead of forcing everything dead-on-grid, and swing adds groove on top.
Scale quantize snaps notes to a chosen key or scale, like C major pentatonic, so wrong notes get pulled into key automatically.
Velocity controls how loud each note hits, shown by color, and articulation options let you shape notes further.