The context's active sink changed, including changes made outside Cacophony.
Fired once when the audio context is unlocked by the first user gesture
(touchend / click / keydown) via the auto-unlock listeners installed by
the Cacophony constructor. Not fired when autoUnlock: false is set
or when the context was already running. See RuntimeOptions.autoUnlock.
Global Cacophony events including audio sessions, loading, and cache operations.