The Learn function in Automap relies on plug-ins sending automation data when a control is moved on the GUI with the mouse.
If the plug-in does not send the appropriate automation data then you will need to use an alternative way to learn the controls.
This can be done one of three ways;
1. If your host application allows you to view the controls of a plug-in without using the plug-ins own GUI you can learn the controls using this alternative view. (Logic and Ableton Live both allow you to do this)
2. You can use the controller itself to learn controls. If the parameter you wish to assign is already mapped to a different control on your Automap controller, simply tweak the parameter using the 'old' control, then click the 'Learn' button on the Automap GUI and move the 'new' control that you wish to assign the parameter to.
3. The automap files that define the parameter layout of each plug-in in Automap can be edited manually as explained in the following article;