Index: src/routes/posts.js
===================================================================
--- src/routes/posts.js	(revision ca25f360f73b889318b921f39ff70bb54eb6d853)
+++ src/routes/posts.js	(revision 30271e652b4f48014f6853585c1628a8ee02f3c8)
@@ -848,4 +848,5 @@
     canManageSite,
     siteAvatar,
+    postHasPlayableAudio: ActivityPubService.hasPlayableAudio(post.content || '', site.id),
     pageTitle: post.title + ' - ' + site.title,
     socialDescr: post.excerpt || '',