Soundy in 404.php?

I would like to have my WordPress theme’s 404 page play a specific sound using Soundy, which is installed on my site and working fine on two pages so far.

I have no Soundy meta-box to fiddle with for the 404 page, of course. I get the impression that I can use a shortcode or a function like soundy_button(); but I can’t seem to find any documentation on how to use that. Any ideas, folks??

Many thanks,
Brad

https://wordpress.org/plugins/soundy-background-music/