Best Controller for MAC OS X

[audio_elf]

Kazoo requires an OpenHome compatible renderer so won't work with the BelCanto "out the box". However if you install BubbleUPnPServer that emulates OpenHome for any normal UPnP renderer and will allow Kazoo to work.

(link for bubbleserver -- http://www.bubblesoftapps.com/bubbleupnpserver/ )

The other option would be to try J.River on your Mac but I've no idea how good it works as a UPnP controller or if you still have to use its own server.

Not many options around for UPnP Control Point on OS X.