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+<?xml version="1.0" standalone="no"?>
+
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
+
+]>
+
+<section id="sn-clocks">
+  <title>Clocks</title>
+  <para>
+    There are several clock displays in the user interface for Ardour:
+  </para>
+
+  <itemizedlist>
+    <listitem>
+      <para>
+        Primary transport clock
+      </para>
+    </listitem>
+
+    <listitem>
+      <para>
+        Secondary transport clock
+      </para>
+    </listitem>
+
+    <listitem>
+      <para>
+        Nudge clock
+      </para>
+    </listitem>
+
+    <listitem>
+      <para>
+        Region position and length clocks
+      </para>
+    </listitem>
+
+    <listitem>
+      <para>
+        SMPTE offset clock
+      </para>
+    </listitem>
+  </itemizedlist>
+
+  <para>
+    and more. All of these clocks provide the same operations and can be
+    used in the same way.
+  </para>
+
+  <section id="clock-operations">
+    <title>Clock Operations</title>
+    <section id="changing-clock-mode">
+      <title> Changing Clock Mode </title>
+      <para>
+        All clocks can be used in any one of 5 modes:
+      </para>
+
+      <itemizedlist>
+        <listitem>
+          <para>
+            SMPTE time
+          </para>
+        </listitem>
+
+        <listitem>
+          <para>
+            BBT time
+          </para>
+        </listitem>
+
+        <listitem>
+          <para>
+            Audio frames
+          </para>
+        </listitem>
+
+        <listitem>
+          <para>
+            Minutes:Seconds
+          </para>
+        </listitem>
+
+        <listitem>
+          <para>
+            Off
+          </para>
+        </listitem>
+      </itemizedlist>
+
+      <para>
+        To change clock modes, simply ContextClick on the clock, and select
+        the desired mode from the popup menu.
+      </para>
+    </section>
+
+    <section id="editing-clock-values">
+      <title> Editing Clock Values </title>
+      <para></para>
+    </section>
+  </section>
+<!--
+<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" 
+	href="Some_Subsection.xml" />
+-->
+</section>