Associates a sound cue with key by setting the target's audio entry (cueKeyFor
picks the family's <type>.audio for a channel key with no cue of its own). An empty
path clears the cue (removing the entry rather than storing an empty string, which
validateMessageAudio would flag).
Associates a sound cue with
keyby setting the target's audio entry (cueKeyForpicks the family's<type>.audiofor a channel key with no cue of its own). An empty path clears the cue (removing the entry rather than storing an empty string, whichvalidateMessageAudiowould flag).