
 Mouse operations in the sample windows
 --------------------------------------

                SELECT  click           set cursor, gain caret, set track
                ADJUST  click           gain caret, set track
                SELECT  drag            reset selection, start drag
                ADJUST  drag            adjust selection
         Shift  SELECT  click           set selection start or end
         Shift  ADJUST  click           as ADJUST click
         Shift  SELECT  drag            'Sonic' style set selection
         Shift  ADJUST  drag            as ADJUST drag
  Shift  Ctrl   SELECT  click           select region



 In envelope editing mode:

                SELECT  drag            insert new point if necessary
                                        move point
                ADJUST  drag            move nearest point
         Shift  SELECT  click           delete point
         Ctrl   SELECT  drag            move envelop up/down
