Index: src/routes/admin-audio.js
===================================================================
--- src/routes/admin-audio.js	(revision 91094a44a78eaba7694534a039a5d0843f451e10)
+++ src/routes/admin-audio.js	(revision 8d32dcf6552ef4dcd02cb0465748921a55ac674b)
@@ -91,8 +91,11 @@
   }));
 
+  const base = (process.env.PUBLIC_BASE_URL || ('https://' + (req.get('host') || ''))).replace(/\/$/, '');
+  const embedUrl = base + (res.locals.siteUrlBase || '') + '/embed';
   renderPage(req, res, 'pages/admin-audio', {
     pageTitle: 'Audio tracks',
     bodyClass: 'on-admin',
     tracks,
+    embedUrl,
     error: req.query.error || null,
     success: req.query.success || null,