Per instrument group — djembes, dununs+bells, and shekere each cycle at their own speed, so they genuinely drift in and out of phase, pulling closer together and further apart. Spread sets how far each group can shift; Split pulls the groups toward moving as one (0% = together); Djembe split spreads the individual djembes apart so they weave against each other too; the group sliders set each cycle length, 10s (left) to 1s (right).