This utility lets you select keys within a specified start and end range of time. Its main purpose is to let you select a large range of time, when using the mouse might be awkward.
Note: Although this utility works in Edit Time mode, you can’t see the key selection because keys are not displayed in that mode.
Start Time: Specifies the start range for key selection.
End Time: Specifies the end range for key selection.
The Start Time and End Time spinners are initialized to match the current time selection.
Clear Previous Selection: If Clear Previous Selection is selected, all keys are cleared before keys within the specified time range are selected.
If the Modify Subtree button is on, you can select all keys in the descendants of a single track by just selecting that track.