Maybe this helps...
Playing 1 track only out of many;
CONTROL S makes the chosen track play solo. This is a toggle.
Starting a new track;
I need more explaination as to what you are trying to do here.
Duplicating an existing track;Select the track in whole or in part. then CONTROL D.
Selecting a portion of audio in 1 track as opposed to having yourUnselect the tracks to be unaffected . Then select the section of the
selection stretch over multiple tracks;
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