Look at remaining fields.

manifests/config.pp

@@ -151,6 +151,10 @@ define mpd::config (
     filesystem_charset               => $filesystem_charset,
     metadata_to_use                  => $metadata_to_use,
     auto_update_depth                => $auto_update_depth,
+    connection_timeout               => $connection_timeout,
+    max_connections                  => $max_connections,
+    max_playlist_length              => $max_playlist_length,
+    max_output_buffer_size           => $max_output_buffer_size,
   }
 
   concat::fragment { "mpd_base_config ${name}":