+<p>
+ In Ardour, you work in two main windows: the <dfn>Editor</dfn> and the
+ <dfn>Mixer</dfn>.
+</p>
+<img class="right" src="/ardour/manual/html/diagrams/editor-summary.png"
+alt="Ardour's editor window" />
+<p>
+ The <dfn>Editor</dfn> window includes the editor track <dfn>canvas</dfn>
+ where you can arrange audio and MIDI data along a timeline. This is the
+ window you will be in while editing and arranging a project. The window
+ has a general "horizontal" sense to it: the timeline flows from left to
+ right, the playhead showing the current position in the session moves
+ from left to right — the window really represents <dfn>time</dfn>
+ in a fairly literal way.
+</p>
+<img class="right" src="/ardour/manual/html/diagrams/mixer-summary.png"
+alt="ardour's mixer window" />
+<p>
+ The <dfn>Mixer</dfn> window on the other hand represents signal flow and
+ is the window you will probably be using most when mixing a session. It
+ includes <dfn>channel strips</dfn> for each track and bus in your session.
+ It has a general "vertical" sense to it: signals flow from the top of each
+ channel strip through the processing elements in the strip to reach the
+ output listed at the bottom.
+</p>
+<p>
+ It is possible to show a single channel strip in the editor window, and
+ some people find this enough to work on mixing without actually opening
+ the mixer window. Most of the time though, you will want both of these
+ windows at various stages of a session's lifetime — sometimes
+ you'll be focused on editing, sometimes on mixing and possibly some of
+ the time on both.
+</p>