@Matt_SF AAAAH now I see what you mean!

Jesus christ I see it. I've declared the parameter control twice:

template <int P> void setParameter(double v)
{
}

Fixed and successfully compiled!

Now how do I use it? Add it as a hardcoded FX , remove my ScriptFX network and change my interface references?
Then if I want to make changes to the network I have to do it all over?

Thank you so much you've made my day, finally feel like I've actually accomplished something this week and learned a bunch on the way.

@Christoph-Hart You're a legend man, thanks. Having a lot of fun with this. Have a great weekend!

@Adam_G I will try it out on FL Studio later too, turns out Pro Tools is just stuck note hell in general.