Just to add to my previous post. What I have noticed is the send from the insert plug in is active on all channels. the issue is with MIRs returns.
I started a new session and imported one stereo file. (I did notice that some audio files import as dual mono and some as stereo - If the tracks were bounced out of cubase this is a common issue with Cubase to PT output Ive read). Anyway the issue with surround right replicated in this new session.
I think Im going to bite the bullet and purchase however a few things concern me. Here is my take on it.....
I think compositionally its beneficial to build the composition in the MIR environment as the difference inside these rooms is night and day and I would suggest that if one does, one is less likely to layer sample libraries to the extent one generally does without MIR. This is a saving on resources so that's good. Nuendo seems to handle those resources in common with most DAWs quite well....
Pro Tools on the other hand is not so great at handling resources. The demo wouldn't play properly at 512 sample buffers on my system. It was fine at 1024 however playback in the system usage meter did hit 100% at one busy passage. This is without the benefit of any other plug ins whatsoever in play and of course in a mix you would be adding stuff. I don't know enough to understand if MIR works with its own resources independent of the DAW in plug in mode.
In short its a new dawn - be good if MIR was networkable.....
Anyway Id be interested to know if you find the same issue I have identified in my system with PT and MIR in 7.1.2.