You can use VLC Thing which uses VLC and needs to run on a computer 24/7 (windows/mac/pi), you can then connect bluetooth or wifi speakers to that computer to hear the audio. The next step is to install Notify with Sonos SmartThings Smart Apps to play your message. Chime, Words, Music, Etc. You select what you want to hear and the player you want to hear it on (vlc thing) and you then get audio notifications from ST on events. I use them for arrivals, mode changes, motions etc.