I just tried the 2 seperate system files with different zone ids.

It works basicaly the same . If one remote is issueing a volume up for several second and the other remote tries to do anything. The first remote has priority.

If there is no way around this, thats crap.

I just never noticed this on any of my installs because I was just looking for correct communication routing and everything working on an individual basis.

Now that I have it in my home and am using it, I find the problems.