The classes in the API that might be of interest to you are DspNetwork and Node.

Now, to change the actual value of a parameter you need this hidden class

https://github.com/christophhart/HISE/blob/03c420c1d12f7a4457a8b497a6b78bc49d250e85/hi_scripting/scripting/scriptnode/api/NodeBase.h#L117

So give it a try. First you'll have to find out the name of the dropdown parameter, then you could maybe try to pass ints 1, 2, 3... or 0, 1, 2... or a straight up string.

GOAT activity. ☝

@clevername27 LOL....I feel a bit bad about that. I didn't know it would do that.

I got it working!
Thanks to everyone for the help....it's greatly appreciated!