Not sure if this was mentioned or is it XDK or C2 issue so I will post it here first.
On XDK crosswalk beta/stable music (files from folder Music in C2) can't be muted/unmuted and they do not respect "set volume" actions.
I have a global variable "Music" that can be change in runtime and one music file playing with tag "music":
music = 0 -> Set "music" muted
music = 1 -> Set "music" unmuted
music = 2 -> Set "music" volume to lerp(Audio.Volume("music"), 20, 8*dt)
none of this events works on crosswalk :/