The <dfn>Summary</dfn> is a global overview of the session, allowing for a good "bird's eye" view of where in time and tracks the work happens.
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Each horizontal line represents a track in the session, with the colored bars being the audio and MIDI regions, colored as per their track's color setting.
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Two yellow vertical lines show the position of the <em>Start</em> and <em>End</em> markers, defining the session's length. The red line shows the playhead's position.
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The transparent white rectangle represents what's actually displayed in the Editor window, i.e. what part of the session is beign looked at on screen.