47 lines
2.0 KiB
HTML
47 lines
2.0 KiB
HTML
---
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layout: default
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title: Equivalent Region Selection
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---
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<p>
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<a href="/working-with-tracks/track-and-bus-groups/">Track Groups</a> have
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a property titled <kbd class="option">Select</kbd> which, if enabled, cause
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Ardour to propagate a region selection in one track of a group to the
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<dfn>equivalent regions</dfn> of the other tracks in that group.
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</p>
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<p>
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For example, let's assume you have used multiple microphones to record a
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drum kit to multiple tracks. You have created a track group, added all the
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drum tracks, enabled the group and enabled the Select property for the group.
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When you select a region in one of the drum tracks, Ardour will select the
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corresponding region in every other drum track, which in turn means that a
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subsequent edit operation will affect all the drum tracks together.
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</p>
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<h2>How Ardour Decides Which Regions are "Equivalent"</h2>
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<p>
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Regions in different tracks are considered to be equivalent for the purposes
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of sharing <dfn>selection</dfn> if they satisfy <em>all</em> the following criteria:
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</p>
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<ol>
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<li>Each region starts at the <dfn>same offset</dfn> within its source file,</li>
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<li>each region is located at the <dfn>same position</dfn> on the timeline, and</li>
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<li>each region has the <dfn>same length</dfn>.</li>
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</ol>
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<h2>Overlap Equivalence</h2>
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<p>
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Sometimes, the rules outlined above are too strict to get Ardour to do what you
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want. Regions may have been trimmed to slightly different lengths, or positioned
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slightly differently, and this will cause Ardour to not select regions in other
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grouped tracks.</p>
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<p>
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In this case, enable
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<kbd class="option">Edit > Preferences > Editor > Use overlap equivalency for
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regions</kbd>. With this option enabled, regions in different tracks will be
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considered equivalent for the purposes of selection if they
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<dfn>overlap</dfn>. This is much more flexible and will cover almost all of the
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cases that the fixed rules above might make cumbersome.
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</p>
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