Sound FX not working?

I have three MP3 files, each roughly 3MB. I’ve applied the Sound FX action to three separate graphics and set them up with these MP3 files. But although the code is set up correctly (as far as I can tell) nothing plays when I click the items.

macOS 10.14.4
Safari 12.1

Tried locally and from a web server.
Is this perhaps a problem with Scriptaculous? I don’t know if it’s getting a little out of date – version 1.9?

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