Well, not for an actor. I may explain what I thought to use it for.
Imaging there's a need to make several announcements for client(s) in game approximately at one time. (They're done by recorded voice) I cannot run them in common way, since they may play simultaneously. I also do not know how many announcements there are to be played (in general case). Thus I thought it would be nice to have a function which manages a queue of sounds - putting new sounds in queue if a sound of this type is already playing.
By the way, how common sound sequence works?