Scales

  A scale is a control that allows you to choose a number that
  is a position within a range.  A scale consists of a box with a
  horizontal line in it.  At a certain point in the horizontal line,
  a boxed arrow points upward to the current setting.

  To change the setting of a scale:

  1.  Move the pointer to the boxed arrow that points to the
      current setting.

  2.  Press MB1 and drag the boxed arrow to the left to
      decrease the setting or to the right to increase the setting.

  3.  Release MB1 when you reach the number you want.

  You can also click on the scale to pick a certain setting.