What exactly are you trying to do?
There’s essentially two things you can get that are “master”:
VolumeAndPanPlugin::Ptr Edit::getMasterVolumePlugin() const
PluginList& Edit::getMasterPluginList() const noexcept
Then you can add plugins, remove plugins etc. in the usual way, it’s just a
PluginList the same as those that live on
If you want to automate master plugin parameters (or the mast vol/pan parameters) you do so like any other parameter (all
AutomationCurves you can add points to). You don’t need to add parameters to tracks to automate them, this is merely a visual thing we do in Waveform.
I hope that helps. If not, maybe there’s a more specific question we can answer?