4 Photos - Dec 24, 2015
Photo: Minimal test setupPhoto: Once a group created, you can still cast to a single Chromecast or to a groupPhoto: The visualization in Chromecast app when casting to a groupPhoto: Conveniently, you can adjust the volume of each Chromecast audio in a group, which is scaled when adjusting it.
In my experience however, the volume wasn't matched anymore after adjusting the general volume.