I would love to see a model focusing on making virtual instruments. There are sample-based virtual instruments, but they do miss some subtleties, and there are

I would love to see a model focusing on making virtual instruments. There are sample-based virtual instruments, but they do miss some subtleties, and there are physics-based ones where some subtleties are preserved, but generally worse sounding because actually modelling real hardware evolved over centuries is really difficult. Even hardware-based instruments like electric guitars/violins/cellos etc. generally sound distinct from and less interesting than their acoustic counterparts. Electric guitar players seem to use various amplifier tricks to make up for that, and that's now a big separate instrument. But I think the point stands.