I made this abstraction to simplify the process of connecting to an Ardour-run plugin through OSC.
You just pick the strip number, plugin number, and parameter number. Data sent to the abstraction's input will be passed to the parameter you choose. You need to make sure that you enable OSC in Ardour by going to Edit > Control Surfaces > Open Sound Control (OSC). You should also make sure Ardour is using the same port as the patch (obvy).
I hope this saves somebody some time digging through Ardour documentation!