Sonos is ip only and dlna at that. I took a look at the open src crestron module and it's a mass of http commands. Building sonos control only makes sense IMHO you can monetize it or you just love a challenge (and have a sugar daddy or no mortgage).

If someone has a workaround better than a screen on their remote that says 'please use the sonos controller to make your musical selection' I would love to hear it and I expect it would be a great addition to this thread.

Switching apps on an iWhatever isn't really a pro-solution, or am I wrong? Do customers tolerate something like that?

Sorry - bit of a hijack, on a re-read. Not so sorry as to delete ;-)