I don't think this is anything to worry about - it's not a removal of the feature, it's just slightly changing the way it works. AFAICT currently we just set a "value" property when we want to do something like change the volume, but in Chrome that actually does a very short crossfade or some effect like that. I think they're warning that they are going to remove that effect and make it set immediately. Which is pretty much what we wanted in the first place!