wheel = 1°/notch (Shift 0.1°, Alt 10°) · slider = drive · ← → = step 1° (Shift 0.1°, Alt 10°) · drag = orbit · right-drag = pan · Ctrl/⌘+wheel = zoom · dbl-click/R = reset

slider = drive mechanism · 1 finger = orbit · pinch = zoom · 2 fingers = pan · double-tap = reset