feedback50
Some plugins have additional controls that are not shown in their instrument faceplate graphical representation on screen. (The UAD Plate140 is one of them). Although some other DAWs seem to have a more comprehensive solution for this (like presenting an optional parametric-only view of the entire plugin interface showing all controls), Sonar can also access these optional parameters.
To access the parameters from the track inspector click the arrows to the right of the Display tab at the bottom of the track inspector and select FX / Show Assignable Controls. Next, right click a control in the track inspector (below the efx bin of the track inspector), select Reassign Control, and choose the additional plugin parameter you wish to adjust.
Unfortunately (in Sonar 7PE anyway, I don't know about 8) the value of each parameter is displayed as a percentage. This is not always helpful, as adjustment in not linear in most cases, making it very difficult to calculate the actual value from the percentage.