I did a grade F--- job of explaining my thinking.
You mentioned "VST". Never heard of it. I just looked it up and found
Virtual Studio Technology
at
https://en.wikipedia.org/wiki/Virtual_Studio_Technology
So, there is a "synthesizer"; sounds nothing like anything I have in mind.
To try again, I really like music and have for decades. The music I like is nearly all classical from between Vivaldi and Rachmaninoff. I liked music so much, if only to learn a little more, while I was a math grad student at Indiana University (with a terrific music school) I started on violin and made some progress on, e.g., the Bach Chaconne, and that is significant work.
The music I like is art with the short definition
"Communication, interpretation of human experience, emotion".
Since no machine can have a "human experience", essentially no machine ever can create such art.
Well, I'd like to pick up my violin again and get back to music as art, but (1) getting good at violin, good enough to "communicate human experience" is not easy, and (2) I'd like also to move past just solo violin to, in two words, a symphony orchestra.
So, I'd like to write, create the music and perform it. Hiring a symphony orchestra would not be cheap.
Every performance of music that is on a DVD has been reduced to just bits, and in terms of current computing, not very many bits. So, necessarily, in principle, a computer could generate such bits, not create the music but just generate the bits.
So I want to use a computer to substitute for part of what an orchestra does. But an orchestra has good musicians that do real art, and, again, a computer can't do that, i.e., we can't hope for software that we can ask to create and give a good performance of something as good as the best of, say, Dvorak.
Well, a violin by itself can't create art, either. All the art has to come from a human using a violin to make the sounds. So, I'm trying to be clear here, I want a computer to substitute for a violin, etc.
For MIDI, I have no interest in that. From all I have seen about MIDI, it is hopeless for the level of art common in orchestras and that I have in mind.
Maybe I've been more clear here: Again, once again, I want to use a computer to perform the music I have in mind.
I don't think the software for what I want exists yet.
And for whatever has been done with pop music, I have no interest in pop music. To me, pop music is nothing like the art I have in mind or saw in the best from Vivaldi through Rachmaninoff. So, in particular, I doubt that I would be interested in anything about computers that have had a role in pop music.
Or, for violinists, I want an expressive performance of the last bars of the D major section of the Bach Chaconne. The performance I have in mind requires careful construction of each note (volume and the nature of the sound and how those change during the extent of the note) and transition (e.g., legato) from one note to the next. A violinist might work for hours to months on just the legato on just a few bars of the Chaconne -- for what I have in mind would take comparable effort. And then move on to more, already in sheet music or that I write.
E.g., for some art, an example of expressiveness, I like the performance at the beginning of the
second movement (Adagio) of the Dvorak Cello Concerto (opus 104) as played by Rostropovich, the Berlin Philharmonic, and von Karajan. I didn't see this on YouTube.
For something expressive on YouTube, I like (parts of) the Nicola Benedetti performance of the Bruch Scottish Fantasy at
https://www.youtube.com/watch?v=YpX8DoS2hr8