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The transmissions transform state from actuator space to joint space (and efforts from joint space to actuator space). The robot is simulated in joint space, so in simulation, the efforts are immediately transformed back into joint space (and the state is first transformed from joint space), as shown in this diagram.

In simulation, the mechanicalReduction and motorTorqueConstant are immediately applied and unapplied, so changing them will have no effect on the simulation. They only change the reported values of the actuators.