The overview line shows the entire sample. The section that is visible in the waveform display is indicated by a rectangle. The current selection range in the waveform display is shown in brown.
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To view a different section of the sample, click in the lower half of the rectangle and drag to the left or right.
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To show a larger or a smaller range of the sample in the main waveform display, resize the rectangle by dragging its borders.
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To specify a new sample range for the main waveform display, click in the upper half of the overview and drag.