Hi Richard,
I'm not quite sure from your original question, but I think you're asking if the MC200 can send content to it's own output/zone and also to an ID40/861 at the same time?

If so the the answer is, yes it can. The MC200 can run it's own outputs (one zone) and also stream to other Sooloos sources/zones at the same time. Usually, different content to each zone, though any of the zones can be linked together to play the same content.

The core in the MC200 could most likely drive another ten sources such as the MS600/C15/ID40 etc, each with different content, before running out of steam.