Toggle the subdivisions you want above (16th-note or triplet — switching family keeps your other
pattern intact), then click a cell to place it — click again with the same combination to erase.
Right-click always erases. Space = play/stop.
Ticks inside each cell show where the hits land within that beat.
The Preset menu loads read-only grooves from great drummers — your own pattern is saved
and comes back when you return to Custom.