Merge pull request #726 from bigpresh/bigpresh/pitch_slider_no_longer_opposite_to_turntables

Pitch slider is no longer opposite to turntable/CDJ behaviour

Author: daschuer

source/chapters/user_interface.rst

@@ -622,10 +622,13 @@ control rate changes also from your computer's keyboard, see the chapter
   :ref:`sync-lock` for more information.
 
 **Pitch/Rate slider**
-  The slider allows you to change the speed of the song, by default up to 10%
-  from the tracks original tempos. The speed will increase as you move the
-  slider up, opposite to the behavior found on DJ turntables and :term:`CDJ`.
-  Right-clicking on the slider will reset the tempo to its original value.
+  The slider allows you to change the speed of the song from the track's
+  original tempo.  In default configuration the speed will increase as you move
+  the slider down, and decrease as you move the slider up (similar to the 
+  behaviour found on DJ turntables and :term:`CDJ` units where moving the 
+  slider towards you increases the speed).  Note that the direction can be
+  inverted, and the range of adjustment widened/narrowed by the settings found
+  under "Decks" in Mixxx's preferences.
 
 **Pitch Rate Display**
   The percent that the track's rate is sped up or slowed down is noted here. Is