I'm hoping this works. Presuming Miro 2 CEs knows where to find your instruments these Multis might be helpful?
Note they are only the multi files and contain no instruments, if you don't have Miro 2 CE (or possibly Miro 2 full) they won't do you any good.
Anyway they are an attempt at making multis for the sustains of the solo and section string instruments. They are velocity sensitive and the modwheel is used for 'Expression'. The volume of each dynamic layer varies significantly so sometimes I think the velocity jump is pretty smooth for some notes but jarring for others. The dynamic layers are layered from top to bottom and its pretty easy to adjust them with the sliders. Also not every dynamic layer goes all the way to the top of the instrument so in some instruments the top notes might have some layer gaps.
Not perfect but a try at addressing a weakness in the orchestra of not having velocity sensitive articulations and not using the modwheel.
http://www.mediafire.com/file/l4gafp2ed ... ultis_.zip
Note I cranked up the volume some with the modwheel wide open so start with the modwheel down a bit.