Hi Mark,
How are you rounding your controller output? If you are using the quantizer block, there is a checkbox for "treat gain when your are linearizing", make sure it is checked. If you use any other block (rounding function block in Math library, matlab fcn block etc.), you can always right-click on the block and select "Linear Analysis->Specify Linearization..." menu to set the linearization of the block to a certain value, such as gain of 1. You can even make the linearization depend on the input value if you choose to use configuration function for specifying linearization of the block. You can check the following for more information:
Regards, Erman Korkut
