I was wondering does VSTGUI supports one control connecting to multiple parameters? Or would I need to implement this infrastructure?
I’ve looked through CControl and see that it does not currently support it, but maybe there is functionality I have missed in the documentation or in the SDK?
No it does not support it directly. But my framework Jamba is built on top of VST3/VSTGUI and added this support. So yes it is possible to develop your own infrastructure to make it happen (it is not trivial and a lot of work though). You can look at what I did since the code is open source…