You can play from a Sonicorbiter OS based device to a Chromecast Audio or otehr Chromecast enabled device.

To do this you need to install the BubbleUPnP Server and MinimServer (DLNA server). Both of these can be installed from the Software manager -> manage -> Apps -> Software Manager -> Avalible Apps

MinimServer will make all your music available to any DLNA capable device

BubbleUPnP Server will make any DLNA server available to Chromecast.

More information

Installing and managing MinimServer (DLNA server)