You cannot trigger an event from a state change, but you can trigger a sound's playback using a switch container in continuous mode:
- assign your state group and state to a switch container
- assign the sound you want to trigger to the relevant state in this container
- set the container's Play Mode to continuous
Then at runtime:
- start the switch container early on (maybe from an init event or something), it will be silently waiting
- when your state changes to the desired value, the switch container will play the relevant sound
Hope this helps :)