Actually this feature is handled by the plug-in. In CopperLan, the controller just sends the knob/slider/controller position to the target. Then it's up to the target to handle it in the right way, applying a curve or not.
However it's possible for a CopperLan target to specify the Middle-Point position, resulting in a visual change of the controller display. But this feature is not yet supported by CopperPlug editor. I add it to the to-do list.
sunmachine wrote:Here's an example that shows the problem I'm having:
non-linear-value.png
Your image confirms Phil's explanation: The parameter value presented by the plug-in is not consistent with the physical position of the knob it draws. This is a weird VST implementation.