I have previously posted asking how to configure JRiver to send stereo to multiple zones. I have now come up with a solution. This is the best I could manage without moving to pro audio type solution. I would still like to implement a master volume for the convolution channels but for now I guess I have to live with this setup. It was a slow progress from 2 speakers to the current 26 speakers setup. It took me 5 years to get the 4 speakers correct and last few months for the rest of the speakers. The convolution works for stereo setup too and it doesn't cost much.
p.s. Where is the "Preview" button?