I'm not getting any audio on Linux/Chrome (Debian.) No audio from this page either https://d21u3ic0kp9e91.cloudfront.net/choir/04/index.html https://d21u3ic0kp9

I'm not getting any audio on Linux/Chrome (Debian.) No audio from this page either https://d21u3ic0kp9e91.cloudfront.net/choir/04/index.html https://d21u3ic0kp9e91.cloudfront.net/choir/04/index.html, much to the dismay of our grandchildren. I checked system audio settings and see nothing muted.