That's a neat way to get four wire audio from a 2 channel beltpack.
I have a question regarding the global PL channel that is being sent over fibre. Since it is one feed being fed to all of the sites, I assume it must have all 8 of the RTS talk channels in it. How does this sound to a user at one of the sites? For example, a user at site 1 talks on channel 1 of their beltpack. This is heard locally through all the other beltpacks and through sidetone. This signal is sent to the main site over fibre, through the Artist matrix and back through the fibre path to channel 2 of the RTS beltpacks. Were there any issues with the latency of this audio path causing an echo for users on the local systems? I would imagine this could be avoided if there was a separate send to each of the remote sites because they could listen to the main sites and all of the other remotes minus their own contribution.
It looks like you are using Artist 1100 series panels and Director 6.5. How are you finding the new OLED keys?