Consulting the forum posts, I see I am not alone in wanting an alternative to Halion SE voices.
So, following a recommendation on this forum, I downloaded a VST plugin, and installed it, and I can verify that Dorico can see it. My problem is not that Dorico can’t find it. I just have no idea what to do with it.
So now what? I think I need to set it up in Play mode in the VST rack, but searching the help for “VST rack” turns up nothing useful. I did find the page https://helpcenter.steinberg.de/hc/en-us/articles/206899770-How-to-use-VST2-plug-ins-in-Dorico, which has a link Read more on VST3 … but that link is old and now gives a 404 error.
All the stuff I can find seems to be based on an expectation that I am a Dorico novice that knows all about VST plugins, or at least the ones I have installed. But I’ve been using Dorico since Dorico 1, and have zero understanding of VST plugins and how they work. I am trying to learn from Dorico how to use my first 3rd-party plugin. It’s not even evident to me how I can use Halion SE for instruments other than voices, because selecting the new plugin seems to select it for all instruments, and I’m pretty sure I don’t want a plugin that provides exclusively voices to be associated with guitar.
Up to now I have followed the advice for beginners to ignore the Halion SE editor, and use the Mixer exclusively. That worked great, but it’s time for me to move forward. Any pointers to beginner material would be welcome.