+ <title>Other controls</title>
+
+<para>
+The <guilabel>Refer to existing DCP</guilabel> checkbox isonly
+applicable if the selected content is an existing DCP. It allows you
+to get the audio content from the existing DCP by referencing it
+(rather than copying). See <xref linkend="sec-overlay"/>.
+</para>
+
+<para>
+<guilabel>Show graphs of audio levels</guilabel> will analyse the
+audio of the selected content and plot it on a graph. See <xref
+linkend="sec-show-audio"/> for more details.
+</para>