MULTI-ZONE AUDIO SUPPORT - ACTIVE/ACTIVE/HUB & SPOKE MODEL

Additionally we would also need a XBMC music player that is capable of streaming different media streams simultaneously?
Using the hub and spoke model talked about, we need to be able to stream multiple "songs/channels" at once. Different music in different rooms of the house or the same music in some of the rooms and different in others (similar to Sonos if anyone is familiar).

The real hurdle here is the PAplayer/AudioEngine:
1. Multiple audio outputs, may be able to accomplish this by using multiple instances of the player itself?
2. If 1 is not feasible, how about loading a different audio player that can accomplish this?

Any thoughts?

Not needed in an active/active scenario. The instantiating machine just tells the playback machine what url to play and lets it do the rest.