MIR Pro and Synchron Instruments aren't made for each other. :-)
The latter have been recorded "in situ" (i.e. in the actual position of the instrument(s) in Synchron Stage Vienna), with lots of the ambience and even reverb "burnt in". They are meant to be used in the same way they have been recorded in, all in the same hall.
MIR Pro on the other hand needs quite dry (at least unreverberated) sources, ideally centered, without any bias towards the left or right side. That's the only way to put this source in one of its Venues in a meaningful way, without ending up with a muddy mess of rooms, pannings and reverbs. :-)
... there are mixer presets in Synchron Instruments that try to provide that kind of sound despite their different recording paradigm, but it's not their main goal.
HTH,