Have you tried clicking the play button or double clicking the single, 5 second audio file in the player? It doesn't play by default and it isn't a .gif
Unless you're using Safari 5.1 on Windows (it also explicitly states modern versions), the supported browsers are seen here https://caniuse.com/#feat=audio-api
Unless you're using Safari 5.1 on Windows (it also explicitly states modern versions), the supported browsers are seen here https://caniuse.com/#feat=audio-api