If you add SendRPC action to VRC_AudioBank from "Events from Scene" menu item (for example Play), you'll see its target value is "Others" in advanced mode.
Then, other players hear the sound but a player triggering the action doesn't. I think this is inappropriate behavior as initial setting and "All" is
useful.
Environment: VRCSDK-2018.02.28.21.21
Workaround: After adding SendRPC, check advanced mode on, and change target value to All (or other value you want)