Mouse:
Click = Recenter
Drag = Zoom In
Alt-Click = Zoom Out
Shift-Click = Zoom Reset

Keys:
(Click image first.)
Sensitivity: ← →
Iterations: ↑ ↓
  (Coarse) Shift-↑ ↓
       (Fine) Alt-↑ ↓

M = Mode: M/R-I
A = Algorithm: A/B
X = Exclusion: (Cycle)
R = Readout: Y/N