The default parameter settings are appropriate for most problems. Several of the numerical tolerances are based on the value of Error Tolerance which is set in the Optimization Properties dialog box. This value should not be greater than 1.0e-2. If it is, Embed uses 1.0e-2 in its place to set the other tolerances. The Error Tolerance should reflect the accuracy of the Embed simulation computations and are based on the step size and other Embed settings.