Beat, this is another response that doesn't meet your criteria, because I don't have time for now, though I'll try to give you what you're asking for later if I get time. In this, I'm sending the same MIDI to all 8 violins, but I'm processing the 8 audio outputs separately, since that's something you can't do with Chamber:
[url]https://drive.google.com/file/d/0B5ZYXb_HdIQhZkc2UEMtbmNUeVk/edit?usp=sharing[/url]
It is MIR-free. Nor did I use Altiverb set to Vienna Konzerthaus, since that hall is shaped like a shoebox, and I get the feeling you might not like accurate simulations of shoebox-shaped spaces.