Looks like 'Fix' and 'Increment' give another way of editing the values set in the preset window but I can't tell the difference between the two.
The trick is to preselect (highlight) a range of lines (using your mouse, or holding the Shift key while using Arrow Up/Down/Left/Right):
Then Fix assigs the same value to all lines. However, Increment assigns incremental values, starting with the value you specify in the "First value" dialog box.
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