System information
Changing an event's length
Drag either edge of an event to change its length. The event  edge will snap to grid lines if snapping  is on. 
Hold the Shift key while dragging to temporarily suspend snapping. For more information, see "Enable 
Snapping" on page 139.
Envelope
To use the Envelope tool  , choose Editing   Tool from the Edit menu, and then choose Envelope  from the 
submenu.
The  Envelope tool  is designed to manipulate envelopes  in events. With the Envelope tool selected, you can 
add, delete,  select, and move envelope points, but events cannot be moved or edited. For more information, 
see "Adjusting Envelopes" on page 266.
Selection
To use the Selection tool  , choose Editing  Tool from the Edit menu, and then choose Selection  from the 
submenu.
The Selection tool is designed to select  multiple events across tracks by drawing selection boxes around the 
events  you want to include. The Selection  tool can draw three types of selection boxes:
Type Description
Free Selection The default behavior of the tool:
n  Click to select individual   events (hold Shift or Ctrl to select 
multiple events).
n  Drag  to draw a rectangular region that begins where you start 
drawing and ends  where you release the mouse button. All of 
the events that are inside  the region will be selected. This 
method is good for selecting a group  of events that are close 
together.
Vertical Can be used  to easily select all events that occur within a time range. 
The vertical  selection box automatically selects all of the tracks 
between your first  mouse click and where you draw the selection box; 
even tracks that are  not visible at the current magnification are 
selected.
Horizontal Can be used  to easily select all events on a single or multiple adjacent 
tracks. The  horizontal selection box automatically selects all events 
on a track that  is touched by the selection box; even events that are 
not visible at the  current magnification are selected.
To change the  type of selection box you are using, right-click the mouse while holding  down the left mouse 
button. Clicking the right mouse button will toggle  through the three types of selection boxes.
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