Legacy Audio Shortcode
If your only issue is that the format is incorrect then switch it in the_content hook with the correct version. Non-local content: Place in a plugin or functions.php // hook earlier than 10 add_filter(‘the_content’, ‘wpse_20160110_the_content_fix_audio’, 0); function wpse_20160110_the_content_fix_audio($content){ return str_replace ( ‘[audio:’, ‘[audio src=”https://wordpress.stackexchange.com/questions/214052/, $content ); }