Extending and Reducing the Selection
You can resize a selection range in the wave window.
There are several ways to extend/reduce the selection:
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Select a range, Shift-click outside the selection range, and drag to the left/right, or click and drag the edges of the selection range to the left/right.
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To extend the selection to the previous/next boundary (marker or start/end of file), press Shift and double-click the non-selected area between the boundaries.