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+\chapter{Structure}
+  \section{Tracks}
+
+      A project contains tracks analog to a conventional tape machine.
+      Tracks contain midi- audio- or controller data.
+      Tracks are presented in two different ways:
+
+      \blank[big]
+      \Input{Arranger:} tracks are displayed in a vertical list
+      \Input{Mixer:} the mixer shows track in a horizontal view
+
+      \par\blank[big]
+
+      Tempo and time signature are internal tracks not shown in the
+      arranger or mixer.
+
+  \section{Parts}
+
+      Midi- and audio tracks can be divided on the time axis into parts.