The Ardour Manual

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Which Regions Are Affected?

This section explains the rules used to decide which regions are affected by editing operations. They don't really have to be understood—hopefully things will Just Work—but it may be useful eventually.

Editing operations in Ardour either operate on a single point in time (Split being the obvious example) or on two points (which can also be considered to be a range of sorts), Separate is a good example of this.

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 use based on the following rules:

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.