Keep time controls the clock constraint for each Hour, Minute, and Second lane. Each lane also shows its physical Hand and Bezel positions plus Time, the value on the bezel currently under the hand. When Keep time is On, choose a Driven element—Hand or Bezel—and give that rotor a Clock, Free, or Coupled Drive. The other rotor compensates continuously so their relative angle still indicates the correct time. When Keep time is Off, Hand and Bezel each expose their own independent Drive; Time remains a truthful indicated reading but is marked ! because it no longer tracks the configured clock.
Clock runs a rotor at that lane's natural clock rate with its own physical CW / CCW direction. Changing Clock direction re-anchors the rotor at its current pose, so it reverses without a position jump. Hand defaults are CW; Bezel defaults are CCW. Free uses its own speed, direction, and phase. Coupled derives motion from any other Hand or Bezel rotor through a ratio, direction, and phase; source choices that would create a mechanical cycle are disabled.
Synchronization uses the same three-second ease-in/out motion as hand positioning and randomization. A rotor's Sync button aligns that Coupled rotor with its selected source, offset by the authored Phase. Sync coupled performs that operation for every active Coupled rotor at once. Sync all brings all active driven rotors to a common instantaneous reference, then their configured Drives continue from the synchronized pose and may diverge again immediately.