Specify the name of the track you want to edit.
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To pick the track from a list, press F2
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The name can contain embedded spaces but trailing spaces will
be ignored.   NOTE:  The name should NOT END WITH THE "+"
since that has special meaning (implies a Waited track Start
when used in a Control Track).

If the track does not exist, then one will be created that will
contain 15 "Null Events" with a start time of zero.

When done editing such a new track, you should delete excess
Null Events at the end of the track.     Note that when a new
track is created, it is temporary until your first SAVE command
or the END command.  I.e. if you exit EDIT without using either a
SAVE or END command, then the new track will be deleted.