manual/include/which-regions-are-affected.html

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<p>
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This section explains the rules used to decide which regions are affected
by editing operations. You don't really have to understand them&mdash;hopefully
things will Just Work&mdash;but it may be useful eventually to understand the rules.
</p>
<p>
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Editing operations in Ardour either operate on a single point in time
(<kbd class="menu">Split</kbd> being the obvious example) or on two
points (which can also be considered to be a range of sorts), <kbd
class="menu">Separate</kbd> is a good example of this.
</p>
<p>
Most operations will operate on the currently selected region(s), but if
no regions are selected, the region that the mouse is in will be used
instead. Single-point operations will generally pick a set of regions to
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use based on the following rules:
</p>
<ul>
<li> If the edit point is `mouse', then
<ul>
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<li>if the mouse is over a selected region, or no region, use all selected
regions, or</li>
<li>if the mouse is over an unselected region, use just that region.</li>
</ul>
</li>
<li> For all other edit points
<ul>
<li>
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use the selected regions <em>and</em> those that are both
under the edit position <em>and</em> on a selected track,
or on a track which is in the same active edit-enabled route group
as a selected region.
</li>
</ul>
</li>
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</ul>
<p>
The rationale here for the two different rules is that the mouse edit point
is special in that its position indicates both a time and a track; the other
edit points (Playhead,Marker) indicate a time only.
</p>