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The existing code relies on AutomationControls for getting parameter changes and update the UI accordingly. One case where this doesn't yet work is preset loading, where ARDOUR::Plugin is responsible for actually loading the preset but doesn't notify the changes to AutomationControls. Since the input_controls vector now contains all ControlUI's that rely on AutomationControls to get updates, just listen to Plugin::PresetLoaded() and trigger an update of all elements in input_controls. This is temporary until a better solution is devised to make AutomationControls aware of preset loading.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html