Audio not Showing Up w/Sparkling Theme

Love Sparkling, but I cannot figure out why audio is not showing up. It’s definitely either the theme or my customizations (It works fine with default theme), but I can’t figure it out. Other similar posts talk about the footer and header being missing, but I see them both in there. Any help is appreciated.

I created a test page to see the problem: https://www.gad.net/Blog/2000/02/10/audio-test/

Audio is included on that page.

Server is Ubuntu and owned/operated by me.

Thanks for any help.