Soldato
Out of interest, how do you connect chromecast to multiple speakers in multiple rooms, and manage playing different songs/playlists on each and/or then merge rooms to play the same music on the fly?
you can create groups of chromecast audios and then cast to the group. I guess you would have to create enough groups to cover all possibly combinations then just cast to whatever group you want - don't think you can cast to more than one group from one device at the moment.